ETH Price: $3,375.22 (+2.94%)

Token

Boson Smart Voucher (BSV)
 

Overview

Max Total Supply

2,584 BSV

Holders

266

Market

Volume (24H)

N/A

Min Price (24H)

N/A

Max Price (24H)

N/A
Filtered by Token Holder
nftybot.eth
Balance
5 BSV
0xf33036ee26db00589811b4062760ddd934c69734
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OVERVIEW

Boson Protocol is the decentralized network on which future commerce will run. And it starts with metaverse commerce. Boson Protocol enables anyone to sell physical products in the metaverse as NFTs within our Decentraland space – Boson Portal. [How it works](https://www.boson...

# Exchange Pair Price  24H Volume % Volume

Contract Source Code Verified (Exact Match)

Contract Name:
Vouchers

Compiler Version
v0.7.6+commit.7338295f

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 20 : Vouchers.sol
// SPDX-License-Identifier: LGPL-3.0-or-later

pragma solidity 0.7.6;

import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import "@openzeppelin/contracts/utils/Pausable.sol";
import "@openzeppelin/contracts/utils/Strings.sol";
import "./interfaces/IVoucherKernel.sol";
import "./interfaces/ICashier.sol";
import "./interfaces/IVouchers.sol";

/**
 * @title Vouchers implemented as ERC-721
 */
contract Vouchers is IVouchers, ERC721, Ownable, Pausable {
    using Address for address;
    using Strings for uint256;

    //min security
    address private voucherKernelAddress; //address of the VoucherKernel contract
    address private cashierAddress; //address of the Cashier contract
    string private contractUri;

    event LogVoucherKernelSet(address _newVoucherKernel, address _triggeredBy);
    event LogCashierSet(address _newCashier, address _triggeredBy);
    event LogUriSet(string _newUri, address _triggeredBy);
    event LogContractUriSet(string _contractUri, address _triggeredBy);

    modifier onlyFromVoucherKernel() {
        require(msg.sender == voucherKernelAddress, "UNAUTHORIZED_VK");
        _;
    }

    modifier notZeroAddress(address _address) {
        require(_address != address(0), "ZERO_ADDRESS");
        _;
    }

    /**
     * @notice Construct and initialze the contract. 
     * @param baseURI_ base metadata uri
     * @param name_ token name
     * @param symbol_ token symbol
     * @param _cashierAddress address of the associated Cashier contract
     * @param _voucherKernelAddress address of the associated Voucher Kernel contract
     */
    constructor(string memory baseURI_, string memory name_, string memory symbol_, address _cashierAddress, address _voucherKernelAddress) 
        ERC721(name_, symbol_) notZeroAddress(_cashierAddress) notZeroAddress(_voucherKernelAddress)
    {
        _setBaseURI(baseURI_);

        cashierAddress = _cashierAddress;
        voucherKernelAddress = _voucherKernelAddress;
        emit LogCashierSet(_cashierAddress, msg.sender);
        emit LogVoucherKernelSet(_voucherKernelAddress, msg.sender);
    }

    /**
     * @notice Pause the process of interaction with voucherID's (ERC-721), in case of emergency.
     * Only BR contract is in control of this function.
     */
    function pause() external override onlyOwner {
        _pause();
    }

    /**
     * @notice Unpause the process of interaction with voucherID's (ERC-721).
     * Only BR contract is in control of this function.
     */
    function unpause() external override onlyOwner {
        _unpause();
    }

    /**
     * @notice Safely transfers the ownership of a given token ID to another address
     * If the target address is a contract, it must implement `onERC721Received`
     * Requires the msg.sender to be the owner, approved, or operator
     * @dev ERC-721
     * @param _from current owner of the token
     * @param _to address to receive the ownership of the given token ID
     * @param _tokenId uint256 ID of the token to be transferred
     * @param _data bytes data to send along with a safe transfer check
     */
     function safeTransferFrom(
        address _from,
        address _to,
        uint256 _tokenId,
        bytes memory _data
    ) public override (ERC721, IERC721)  
    {
        transferFrom(_from, _to, _tokenId);

        _doSafeTransferAcceptanceCheck(
            _from,
            _to,
            _tokenId,
            _data
        );
    }
    /**
     * @notice Transfers the ownership of a given token ID to another address.
     * Usage of this method is discouraged, use `safeTransferFrom` whenever possible.
     * Requires the msg.sender to be the owner, approved, or operator.
     * @dev ERC-721
     * @param _from current owner of the token
     * @param _to address to receive the ownership of the given token ID
     * @param _tokenId uint256 ID of the token to be transferred
     */
    function transferFrom(
        address _from,
        address _to,
        uint256 _tokenId
    ) public 
      override (ERC721, IERC721) 
    {
        super.transferFrom(_from, _to, _tokenId);
        require(IVoucherKernel(voucherKernelAddress).isVoucherTransferable(_tokenId), "FUNDS_RELEASED");

        ICashier(cashierAddress).onVoucherTransfer(
            _from,
            _to,
            _tokenId
        );
    }

    /**
     * @notice Function to mint tokens.
     * @dev ERC-721
     * @param _to The address that will receive the minted tokens.
     * @param _tokenId The token id to mint.
     * @return A boolean that indicates if the operation was successful.
     */
    function mint(address _to, uint256 _tokenId)
        external
        override
        onlyFromVoucherKernel
        returns (bool)
    {
        super._mint(_to, _tokenId);
        _doSafeTransferAcceptanceCheck(
            address(0),
            _to,
            _tokenId,
            ""
        );
        return true;
    }

    /* Burning ERC-721 is not allowed, as a voucher (being an ERC-721 token) has a final state and shouldn't be destroyed. */

    // // // // // // // //
    // METADATA EXTENSIONS
    // // // // // // // //

    /**
     * @notice Setting the URL prefix for tokens metadata
     * @param _newUri   New prefix to be used
     */

    function setTokenURI(string memory _newUri) external onlyOwner {
        require(bytes(_newUri).length != 0, "INVALID_VALUE");
        super._setBaseURI(_newUri);
        emit LogUriSet(_newUri, _msgSender());
    }

    /**
     * @notice Setting a contractURI for OpenSea collections integration.
     * @param _contractUri   The contract URI to be used
     */
    function setContractUri(string memory _contractUri) external onlyOwner {
        require(bytes(_contractUri).length != 0, "INVALID_VALUE");
        contractUri = _contractUri;
        emit LogContractUriSet(_contractUri, _msgSender());
    }

    // // // // // // // //
    // UTILS
    // // // // // // // //

    /**
     * @notice Set the address of the VoucherKernel contract
     * @param _voucherKernelAddress   The address of the Voucher Kernel contract
     */
    function setVoucherKernelAddress(address _voucherKernelAddress)
        external
        override
        onlyOwner
        notZeroAddress(_voucherKernelAddress)
        whenPaused
    {
        voucherKernelAddress = _voucherKernelAddress;

        emit LogVoucherKernelSet(_voucherKernelAddress, msg.sender);
    }

    /**
     * @notice Set the address of the cashier contract
     * @param _cashierAddress   The Cashier contract
     */
    function setCashierAddress(address _cashierAddress)
        external
        override
        onlyOwner
        notZeroAddress(_cashierAddress)
        whenPaused
    {
        cashierAddress = _cashierAddress;
        emit LogCashierSet(_cashierAddress, msg.sender);
    }

    /**
     * @notice Get the address of Voucher Kernel contract
     * @return Address of Voucher Kernel contract
     */
    function getVoucherKernelAddress() 
        external 
        view 
        override
        returns (address)
    {
        return voucherKernelAddress;
    }

    /**
     * @notice Get the address of Cashier contract
     * @return Address of Cashier address
     */
    function getCashierAddress() 
        external 
        view 
        override
        returns (address)
    {
        return cashierAddress;
    }

    /**
     * @notice Check successful transfer if recipient is a contract
     * @dev ERC-721
     * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.4.0-rc.0/contracts/token/ERC721/ERC721.sol
     * @param _from     Address of sender
     * @param _to       Address of recipient
     * @param _tokenId  ID of the token
     * @param _data     Optional data
     */
    function _doSafeTransferAcceptanceCheck(
        address _from,
        address _to,
        uint256 _tokenId,
        bytes memory _data
    ) internal {
        if (_to.isContract()) {
            try IERC721Receiver(_to).onERC721Received(_msgSender(), _from, _tokenId, _data) returns (bytes4 response) {
                if (response != IERC721Receiver.onERC721Received.selector) {
                    revert("ERC721: transfer to a bad receiver implementation");
                }
            } catch Error(string memory reason) {
                revert(reason);
            } catch {
                revert("ERC721: transfer to non ERC721Receiver implementer");
            }
        }
    }

    /**
     * @notice Get the contractURI for Opensea collections integration
     * @return Contract URI
     */
    function contractURI() public view returns (string memory) {
        return contractUri;
    }
}

File 2 of 20 : Address.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 3 of 20 : Ownable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "../utils/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

File 4 of 20 : ERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "../../utils/Context.sol";
import "./IERC721.sol";
import "./IERC721Metadata.sol";
import "./IERC721Enumerable.sol";
import "./IERC721Receiver.sol";
import "../../introspection/ERC165.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";
import "../../utils/EnumerableSet.sol";
import "../../utils/EnumerableMap.sol";
import "../../utils/Strings.sol";

/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable {
    using SafeMath for uint256;
    using Address for address;
    using EnumerableSet for EnumerableSet.UintSet;
    using EnumerableMap for EnumerableMap.UintToAddressMap;
    using Strings for uint256;

    // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
    // which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;

    // Mapping from holder address to their (enumerable) set of owned tokens
    mapping (address => EnumerableSet.UintSet) private _holderTokens;

    // Enumerable mapping from token ids to their owners
    EnumerableMap.UintToAddressMap private _tokenOwners;

    // Mapping from token ID to approved address
    mapping (uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping (address => mapping (address => bool)) private _operatorApprovals;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Optional mapping for token URIs
    mapping (uint256 => string) private _tokenURIs;

    // Base URI
    string private _baseURI;

    /*
     *     bytes4(keccak256('balanceOf(address)')) == 0x70a08231
     *     bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e
     *     bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3
     *     bytes4(keccak256('getApproved(uint256)')) == 0x081812fc
     *     bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465
     *     bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5
     *     bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde
     *
     *     => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^
     *        0xa22cb465 ^ 0xe985e9c5 ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd
     */
    bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;

    /*
     *     bytes4(keccak256('name()')) == 0x06fdde03
     *     bytes4(keccak256('symbol()')) == 0x95d89b41
     *     bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd
     *
     *     => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd == 0x5b5e139f
     */
    bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;

    /*
     *     bytes4(keccak256('totalSupply()')) == 0x18160ddd
     *     bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59
     *     bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7
     *
     *     => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63
     */
    bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor (string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;

        // register the supported interfaces to conform to ERC721 via ERC165
        _registerInterface(_INTERFACE_ID_ERC721);
        _registerInterface(_INTERFACE_ID_ERC721_METADATA);
        _registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _holderTokens[owner].length();
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        return _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token");
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory _tokenURI = _tokenURIs[tokenId];
        string memory base = baseURI();

        // If there is no base URI, return the token URI.
        if (bytes(base).length == 0) {
            return _tokenURI;
        }
        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
        if (bytes(_tokenURI).length > 0) {
            return string(abi.encodePacked(base, _tokenURI));
        }
        // If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.
        return string(abi.encodePacked(base, tokenId.toString()));
    }

    /**
    * @dev Returns the base URI set via {_setBaseURI}. This will be
    * automatically added as a prefix in {tokenURI} to each token's URI, or
    * to the token ID if no specific URI is set for that token ID.
    */
    function baseURI() public view virtual returns (string memory) {
        return _baseURI;
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        return _holderTokens[owner].at(index);
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        // _tokenOwners are indexed by tokenIds, so .length() returns the number of tokenIds
        return _tokenOwners.length();
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        (uint256 tokenId, ) = _tokenOwners.at(index);
        return tokenId;
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(_msgSender() == owner || ERC721.isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(address from, address to, uint256 tokenId, bytes memory _data) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _tokenOwners.contains(tokenId);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || ERC721.isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     d*
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(address to, uint256 tokenId, bytes memory _data) internal virtual {
        _mint(to, tokenId);
        require(_checkOnERC721Received(address(0), to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId); // internal owner

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        // Clear metadata (if any)
        if (bytes(_tokenURIs[tokenId]).length != 0) {
            delete _tokenURIs[tokenId];
        }

        _holderTokens[owner].remove(tokenId);

        _tokenOwners.remove(tokenId);

        emit Transfer(owner, address(0), tokenId);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(address from, address to, uint256 tokenId) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own"); // internal owner
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _holderTokens[from].remove(tokenId);
        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
        require(_exists(tokenId), "ERC721Metadata: URI set of nonexistent token");
        _tokenURIs[tokenId] = _tokenURI;
    }

    /**
     * @dev Internal function to set the base URI for all token IDs. It is
     * automatically added as a prefix to the value returned in {tokenURI},
     * or to the token ID if {tokenURI} is empty.
     */
    function _setBaseURI(string memory baseURI_) internal virtual {
        _baseURI = baseURI_;
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data)
        private returns (bool)
    {
        if (!to.isContract()) {
            return true;
        }
        bytes memory returndata = to.functionCall(abi.encodeWithSelector(
            IERC721Receiver(to).onERC721Received.selector,
            _msgSender(),
            from,
            tokenId,
            _data
        ), "ERC721: transfer to non ERC721Receiver implementer");
        bytes4 retval = abi.decode(returndata, (bytes4));
        return (retval == _ERC721_RECEIVED);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId); // internal owner
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual { }
}

File 5 of 20 : IERC721Receiver.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data) external returns (bytes4);
}

File 6 of 20 : Pausable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "./Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor () {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

File 7 of 20 : Strings.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @dev String operations.
 */
library Strings {
    /**
     * @dev Converts a `uint256` to its ASCII `string` representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        uint256 index = digits - 1;
        temp = value;
        while (temp != 0) {
            buffer[index--] = bytes1(uint8(48 + temp % 10));
            temp /= 10;
        }
        return string(buffer);
    }
}

File 8 of 20 : IVoucherKernel.sol
// SPDX-License-Identifier: LGPL-3.0-or-later
pragma solidity 0.7.6;

import "./../UsingHelpers.sol";

interface IVoucherKernel {
    /**
     * @notice Pause the process of interaction with voucherID's (ERC-721), in case of emergency.
     * Only Cashier contract is in control of this function.
     */
    function pause() external;

    /**
     * @notice Unpause the process of interaction with voucherID's (ERC-721).
     * Only Cashier contract is in control of this function.
     */
    function unpause() external;

    /**
     * @notice Creating a new promise for goods or services.
     * Can be reused, e.g. for making different batches of these (but not in prototype).
     * @param _seller      seller of the promise
     * @param _validFrom   Start of valid period
     * @param _validTo     End of valid period
     * @param _price       Price (payment amount)
     * @param _depositSe   Seller's deposit
     * @param _depositBu   Buyer's deposit
     */
    function createTokenSupplyId(
        address _seller,
        uint256 _validFrom,
        uint256 _validTo,
        uint256 _price,
        uint256 _depositSe,
        uint256 _depositBu,
        uint256 _quantity
    ) external returns (uint256);

    /**
     * @notice Creates a Payment method struct recording the details on how the seller requires to receive Price and Deposits for a certain Voucher Set.
     * @param _tokenIdSupply     _tokenIdSupply of the voucher set this is related to
     * @param _paymentMethod  might be ETHETH, ETHTKN, TKNETH or TKNTKN
     * @param _tokenPrice   token address which will hold the funds for the price of the voucher
     * @param _tokenDeposits   token address which will hold the funds for the deposits of the voucher
     */
    function createPaymentMethod(
        uint256 _tokenIdSupply,
        PaymentMethod _paymentMethod,
        address _tokenPrice,
        address _tokenDeposits
    ) external;

    /**
     * @notice Mark voucher token that the payment was released
     * @param _tokenIdVoucher   ID of the voucher token
     */
    function setPaymentReleased(uint256 _tokenIdVoucher) external;

    /**
     * @notice Mark voucher token that the deposits were released
     * @param _tokenIdVoucher   ID of the voucher token
     * @param _to               recipient, one of {ISSUER, HOLDER, POOL}
     * @param _amount           amount that was released in the transaction
     */
    function setDepositsReleased(
        uint256 _tokenIdVoucher,
        Entity _to,
        uint256 _amount
    ) external;

    /**
     * @notice Tells if part of the deposit, belonging to entity, was released already
     * @param _tokenIdVoucher   ID of the voucher token
     * @param _to               recipient, one of {ISSUER, HOLDER, POOL}
     */
    function isDepositReleased(uint256 _tokenIdVoucher, Entity _to)
        external
        returns (bool);

    /**
     * @notice Redemption of the vouchers promise
     * @param _tokenIdVoucher   ID of the voucher
     * @param _messageSender owner of the voucher
     */
    function redeem(uint256 _tokenIdVoucher, address _messageSender) external;

    /**
     * @notice Refunding a voucher
     * @param _tokenIdVoucher   ID of the voucher
     * @param _messageSender owner of the voucher
     */
    function refund(uint256 _tokenIdVoucher, address _messageSender) external;

    /**
     * @notice Issue a complain for a voucher
     * @param _tokenIdVoucher   ID of the voucher
     * @param _messageSender owner of the voucher
     */
    function complain(uint256 _tokenIdVoucher, address _messageSender) external;

    /**
     * @notice Cancel/Fault transaction by the Seller, admitting to a fault or backing out of the deal
     * @param _tokenIdVoucher   ID of the voucher
     * @param _messageSender owner of the voucher set (seller)
     */
    function cancelOrFault(uint256 _tokenIdVoucher, address _messageSender)
        external;

    /**
     * @notice Cancel/Fault transaction by the Seller, cancelling the remaining uncommitted voucher set so that seller prevents buyers from committing to vouchers for items no longer in exchange.
     * @param _tokenIdSupply   ID of the voucher
     * @param _issuer   owner of the voucher
     */
    function cancelOrFaultVoucherSet(uint256 _tokenIdSupply, address _issuer)
        external
        returns (uint256);

    /**
     * @notice Fill Voucher Order, iff funds paid, then extract & mint NFT to the voucher holder
     * @param _tokenIdSupply   ID of the supply token (ERC-1155)
     * @param _issuer          Address of the token's issuer
     * @param _holder          Address of the recipient of the voucher (ERC-721)
     * @param _paymentMethod   method being used for that particular order that needs to be fulfilled
     */
    function fillOrder(
        uint256 _tokenIdSupply,
        address _issuer,
        address _holder,
        PaymentMethod _paymentMethod
    ) external;

    /**
     * @notice Mark voucher token as expired
     * @param _tokenIdVoucher   ID of the voucher token
     */
    function triggerExpiration(uint256 _tokenIdVoucher) external;

    /**
     * @notice Mark voucher token to the final status
     * @param _tokenIdVoucher   ID of the voucher token
     */
    function triggerFinalizeVoucher(uint256 _tokenIdVoucher) external;

    /**
     * @notice Set the address of the new holder of a _tokenIdSupply on transfer
     * @param _tokenIdSupply   _tokenIdSupply which will be transferred
     * @param _newSeller   new holder of the supply
     */
    function setSupplyHolderOnTransfer(
        uint256 _tokenIdSupply,
        address _newSeller
    ) external;

    /**
     * @notice Set the general cancelOrFault period, should be used sparingly as it has significant consequences. Here done simply for demo purposes.
     * @param _cancelFaultPeriod   the new value for cancelOrFault period (in number of seconds)
     */
    function setCancelFaultPeriod(uint256 _cancelFaultPeriod) external;

    /**
     * @notice Set the address of the Boson Router contract
     * @param _bosonRouterAddress   The address of the BR contract
     */
    function setBosonRouterAddress(address _bosonRouterAddress) external;

    /**
     * @notice Set the address of the Cashier contract
     * @param _cashierAddress   The address of the Cashier contract
     */
    function setCashierAddress(address _cashierAddress) external;

    /**
     * @notice Set the address of the Vouchers token contract, an ERC721 contract
     * @param _voucherTokenAddress   The address of the Vouchers token contract
     */
    function setVoucherTokenAddress(address _voucherTokenAddress) external;

    /**
     * @notice Set the address of the Voucher Sets token contract, an ERC1155 contract
     * @param _voucherSetTokenAddress   The address of the Voucher Sets token contract
     */
    function setVoucherSetTokenAddress(address _voucherSetTokenAddress)
        external;

    /**
     * @notice Set the general complain period, should be used sparingly as it has significant consequences. Here done simply for demo purposes.
     * @param _complainPeriod   the new value for complain period (in number of seconds)
     */
    function setComplainPeriod(uint256 _complainPeriod) external;

    /**
     * @notice Get the promise ID at specific index
     * @param _idx  Index in the array of promise keys
     * @return      Promise ID
     */
    function getPromiseKey(uint256 _idx) external view returns (bytes32);

    /**
     * @notice Get the address of the token where the price for the supply is held
     * @param _tokenIdSupply   ID of the voucher token
     * @return                  Address of the token
     */
    function getVoucherPriceToken(uint256 _tokenIdSupply)
        external
        view
        returns (address);

    /**
     * @notice Get the address of the token where the deposits for the supply are held
     * @param _tokenIdSupply   ID of the voucher token
     * @return                  Address of the token
     */
    function getVoucherDepositToken(uint256 _tokenIdSupply)
        external
        view
        returns (address);

    /**
     * @notice Get Buyer costs required to make an order for a supply token
     * @param _tokenIdSupply   ID of the supply token
     * @return                  returns a tuple (Payment amount, Buyer's deposit)
     */
    function getBuyerOrderCosts(uint256 _tokenIdSupply)
        external
        view
        returns (uint256, uint256);

    /**
     * @notice Get Seller deposit
     * @param _tokenIdSupply   ID of the supply token
     * @return                  returns sellers deposit
     */
    function getSellerDeposit(uint256 _tokenIdSupply)
        external
        view
        returns (uint256);

    /**
     * @notice Get the promise ID from a voucher token
     * @param _tokenIdVoucher   ID of the voucher token
     * @return                  ID of the promise
     */
    function getIdSupplyFromVoucher(uint256 _tokenIdVoucher)
        external
        pure
        returns (uint256);

    /**
     * @notice Get the promise ID from a voucher token
     * @param _tokenIdVoucher   ID of the voucher token
     * @return                  ID of the promise
     */
    function getPromiseIdFromVoucherId(uint256 _tokenIdVoucher)
        external
        view
        returns (bytes32);

    /**
     * @notice Get all necessary funds for a supply token
     * @param _tokenIdSupply   ID of the supply token
     * @return                  returns a tuple (Payment amount, Seller's deposit, Buyer's deposit)
     */
    function getOrderCosts(uint256 _tokenIdSupply)
        external
        view
        returns (
            uint256,
            uint256,
            uint256
        );

    /**
     * @notice Get the remaining quantity left in supply of tokens (e.g ERC-721 left in ERC-1155) of an account
     * @param _tokenSupplyId  Token supply ID
     * @param _owner    holder of the Token Supply
     * @return          remaining quantity
     */
    function getRemQtyForSupply(uint256 _tokenSupplyId, address _owner)
        external
        view
        returns (uint256);

    /**
     * @notice Get the payment method for a particular _tokenIdSupply
     * @param _tokenIdSupply   ID of the voucher supply token
     * @return                  payment method
     */
    function getVoucherPaymentMethod(uint256 _tokenIdSupply)
        external
        view
        returns (PaymentMethod);

    /**
     * @notice Get the current status of a voucher
     * @param _tokenIdVoucher   ID of the voucher token
     * @return                  Status of the voucher (via enum)
     */
    function getVoucherStatus(uint256 _tokenIdVoucher)
        external
        view
        returns (
            uint8,
            bool,
            bool,
            uint256,
            uint256
        );

    /**
     * @notice Get the holder of a supply
     * @param _tokenIdSupply    _tokenIdSupply ID of the order (aka VoucherSet) which is mapped to the corresponding Promise.
     * @return                  Address of the holder
     */
    function getSupplyHolder(uint256 _tokenIdSupply)
        external
        view
        returns (address);

    /**
     * @notice Get the issuer of a voucher
     * @param _voucherTokenId ID of the voucher token
     * @return                Address of the seller, when voucher was created
     */
    function getVoucherSeller(uint256 _voucherTokenId)
        external
        view
        returns (address);

    /**
     * @notice Get the holder of a voucher
     * @param _tokenIdVoucher   ID of the voucher token
     * @return                  Address of the holder
     */
    function getVoucherHolder(uint256 _tokenIdVoucher)
        external
        view
        returns (address);

    /**
     * @notice Checks whether a voucher is in valid period for redemption (between start date and end date)
     * @param _tokenIdVoucher ID of the voucher token
     */
    function isInValidityPeriod(uint256 _tokenIdVoucher)
        external
        view
        returns (bool);

    /**
     * @notice Checks whether a voucher is in valid state to be transferred. If either payments or deposits are released, voucher could not be transferred
     * @param _tokenIdVoucher ID of the voucher token
     */
    function isVoucherTransferable(uint256 _tokenIdVoucher)
        external
        view
        returns (bool);

    /**
     * @notice Get address of the Boson Router contract to which this contract points
     * @return Address of the Boson Router contract
     */
    function getBosonRouterAddress() external view returns (address);

    /**
     * @notice Get address of the Cashier contract to which this contract points
     * @return Address of the Cashier contract
     */
    function getCashierAddress() external view returns (address);

    /**
     * @notice Get the token nonce for a seller
     * @param _seller Address of the seller
     * @return The seller's
     */
    function getTokenNonce(address _seller) external view returns (uint256);

    /**
     * @notice Get the current type Id
     * @return type Id
     */
    function getTypeId() external view returns (uint256);

    /**
     * @notice Get the complain period
     * @return complain period
     */
    function getComplainPeriod() external view returns (uint256);

    /**
     * @notice Get the cancel or fault period
     * @return cancel or fault period
     */
    function getCancelFaultPeriod() external view returns (uint256);

    /**
     * @notice Get promise data not retrieved by other accessor functions
     * @param _promiseKey   ID of the promise
     * @return promise data not returned by other accessor methods
     */
    function getPromiseData(bytes32 _promiseKey)
        external
        view
        returns (
            bytes32,
            uint256,
            uint256,
            uint256,
            uint256
        );

    /**
     * @notice Get the promise ID from a voucher set
     * @param _tokenIdSupply   ID of the voucher token
     * @return                  ID of the promise
     */
    function getPromiseIdFromSupplyId(uint256 _tokenIdSupply)
        external
        view
        returns (bytes32);

    /**
     * @notice Get the address of the Vouchers token contract, an ERC721 contract
     * @return Address of Vouchers contract
     */
    function getVoucherTokenAddress() external view returns (address);

    /**
     * @notice Get the address of the VoucherSets token contract, an ERC155 contract
     * @return Address of VoucherSets contract
     */
    function getVoucherSetTokenAddress() external view returns (address);
}

File 9 of 20 : ICashier.sol
// SPDX-License-Identifier: LGPL-3.0-or-later

pragma solidity 0.7.6;

import "./../UsingHelpers.sol";

interface ICashier {
    /**
     * @notice Pause the Cashier && the Voucher Kernel contracts in case of emergency.
     * All functions related to creating new batch, requestVoucher or withdraw will be paused, hence cannot be executed.
     * There is special function for withdrawing funds if contract is paused.
     */
    function pause() external;

    /**
     * @notice Unpause the Cashier && the Voucher Kernel contracts.
     * All functions related to creating new batch, requestVoucher or withdraw will be unpaused.
     */
    function unpause() external;

    function canUnpause() external view returns (bool);

    /**
     * @notice Trigger withdrawals of what funds are releasable
     * The caller of this function triggers transfers to all involved entities (pool, issuer, token holder), also paying for gas.
     * @dev This function would be optimized a lot, here verbose for readability.
     * @param _tokenIdVoucher  ID of a voucher token (ERC-721) to try withdraw funds from
     */
    function withdraw(uint256 _tokenIdVoucher) external;

    function withdrawSingle(uint256 _tokenIdVoucher, Entity _to) external;

    /**
     * @notice External function for withdrawing deposits. Caller must be the seller of the goods, otherwise reverts.
     * @notice Seller triggers withdrawals of remaining deposits for a given supply, in case the voucher set is no longer in exchange.
     * @param _tokenIdSupply an ID of a supply token (ERC-1155) which will be burned and deposits will be returned for
     * @param _burnedQty burned quantity that the deposits should be withdrawn for
     * @param _messageSender owner of the voucher set
     */
    function withdrawDepositsSe(
        uint256 _tokenIdSupply,
        uint256 _burnedQty,
        address payable _messageSender
    ) external;

    /**
     * @notice Get the amount in escrow of an address
     * @param _account  The address of an account to query
     * @return          The balance in escrow
     */
    function getEscrowAmount(address _account) external view returns (uint256);

    /**
     * @notice Update the amount in escrow of an address with the new value, based on VoucherSet/Voucher interaction
     * @param _account  The address of an account to query
     */
    function addEscrowAmount(address _account) external payable;

    /**
     * @notice Update the amount in escrowTokens of an address with the new value, based on VoucherSet/Voucher interaction
     * @param _token  The address of a token to query
     * @param _account  The address of an account to query
     * @param _newAmount  New amount to be set
     */
    function addEscrowTokensAmount(
        address _token,
        address _account,
        uint256 _newAmount
    ) external;

    /**
     * @notice Hook which will be triggered when a _tokenIdVoucher will be transferred. Escrow funds should be allocated to the new owner.
     * @param _from prev owner of the _tokenIdVoucher
     * @param _to next owner of the _tokenIdVoucher
     * @param _tokenIdVoucher _tokenIdVoucher that has been transferred
     */
    function onVoucherTransfer(
        address _from,
        address _to,
        uint256 _tokenIdVoucher
    ) external;

    /**
     * @notice After the transfer happens the _tokenSupplyId should be updated in the promise. Escrow funds for the deposits (If in ETH) should be allocated to the new owner as well.
     * @param _from prev owner of the _tokenSupplyId
     * @param _to next owner of the _tokenSupplyId
     * @param _tokenSupplyId _tokenSupplyId for transfer
     * @param _value qty which has been transferred
     */
    function onVoucherSetTransfer(
        address _from,
        address _to,
        uint256 _tokenSupplyId,
        uint256 _value
    ) external;

    /**
     * @notice Get the address of Voucher Kernel contract
     * @return Address of Voucher Kernel contract
     */
    function getVoucherKernelAddress() external view returns (address);

    /**
     * @notice Get the address of Boson Router contract
     * @return Address of Boson Router contract
     */
    function getBosonRouterAddress() external view returns (address);

    /**
     * @notice Get the address of the Vouchers contract, an ERC721 contract
     * @return Address of Vouchers contract
     */
    function getVoucherTokenAddress() external view returns (address);

    /**
     * @notice Get the address of the VoucherSets token contract, an ERC155 contract
     * @return Address of VoucherSets contract
     */
    function getVoucherSetTokenAddress() external view returns (address);

    /**
     * @notice Ensure whether or not contract has been set to disaster state
     * @return disasterState
     */
    function isDisasterStateSet() external view returns (bool);

    /**
     * @notice Get the amount in escrow of an address
     * @param _token  The address of a token to query
     * @param _account  The address of an account to query
     * @return          The balance in escrow
     */
    function getEscrowTokensAmount(address _token, address _account)
        external
        view
        returns (uint256);

    /**
     * @notice Set the address of the BR contract
     * @param _bosonRouterAddress   The address of the Cashier contract
     */
    function setBosonRouterAddress(address _bosonRouterAddress) external;

    /**
     * @notice Set the address of the VoucherKernel contract
     * @param _voucherKernelAddress   The address of the VoucherKernel contract
     */
    function setVoucherKernelAddress(address _voucherKernelAddress) external;

    /**
     * @notice Set the address of the Vouchers token contract, an ERC721 contract
     * @param _voucherTokenAddress   The address of the Vouchers token contract
     */
    function setVoucherTokenAddress(address _voucherTokenAddress) external;

    /**
     * @notice Set the address of the Voucher Sets token contract, an ERC1155 contract
     * @param _voucherSetTokenAddress   The address of the Voucher Sets token contract
     */
    function setVoucherSetTokenAddress(address _voucherSetTokenAddress)
        external;
}

File 10 of 20 : IVouchers.sol
// SPDX-License-Identifier: LGPL-3.0-or-later
pragma solidity 0.7.6;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Metadata.sol";

interface IVouchers is IERC721, IERC721Metadata {
    /**
     * @notice Pause the Cashier && the Voucher Kernel contracts in case of emergency.
     * All functions related to creating new batch, requestVoucher or withdraw will be paused, hence cannot be executed.
     * There is special function for withdrawing funds if contract is paused.
     */
    function pause() external;

    /**
     * @notice Unpause the Cashier && the Voucher Kernel contracts.
     * All functions related to creating new batch, requestVoucher or withdraw will be unpaused.
     */
    function unpause() external;

    /**
     * @notice Function to mint tokens.
     * @dev ERC-721
     * @param _to The address that will receive the minted tokens.
     * @param _tokenId The token id to mint.
     * @return A boolean that indicates if the operation was successful.
     */
    function mint(address _to, uint256 _tokenId) external returns (bool);

    /**
     * @notice Set the address of the VoucherKernel contract
     * @param _voucherKernelAddress The address of the Voucher Kernel contract
     */
    function setVoucherKernelAddress(address _voucherKernelAddress) external;

    /**
     * @notice Set the address of the Cashier contract
     * @param _cashierAddress   The address of the Cashier contract
     */
    function setCashierAddress(address _cashierAddress) external;

    /**
     * @notice Get the address of Voucher Kernel contract
     * @return Address of Voucher Kernel contract
     */
    function getVoucherKernelAddress() external view returns (address);

    /**
     * @notice Get the address of Cashier contract
     * @return Address of Cashier address
     */
    function getCashierAddress() external view returns (address);
}

File 11 of 20 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

File 12 of 20 : IERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "../../introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
      * @dev Safely transfers `tokenId` token from `from` to `to`.
      *
      * Requirements:
      *
      * - `from` cannot be the zero address.
      * - `to` cannot be the zero address.
      * - `tokenId` token must exist and be owned by `from`.
      * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
      * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
      *
      * Emits a {Transfer} event.
      */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
}

File 13 of 20 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "./IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {

    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

File 14 of 20 : IERC721Enumerable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "./IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {

    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

File 15 of 20 : ERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
abstract contract ERC165 is IERC165 {
    /*
     * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
     */
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

    /**
     * @dev Mapping of interface ids to whether or not it's supported.
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    constructor () {
        // Derived contracts need only register support for their own interfaces,
        // we register support for ERC165 itself here
        _registerInterface(_INTERFACE_ID_ERC165);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     *
     * Time complexity O(1), guaranteed to always use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return _supportedInterfaces[interfaceId];
    }

    /**
     * @dev Registers the contract as an implementer of the interface defined by
     * `interfaceId`. Support of the actual ERC165 interface is automatic and
     * registering its interface id is not required.
     *
     * See {IERC165-supportsInterface}.
     *
     * Requirements:
     *
     * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
     */
    function _registerInterface(bytes4 interfaceId) internal virtual {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        _supportedInterfaces[interfaceId] = true;
    }
}

File 16 of 20 : SafeMath.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

File 17 of 20 : EnumerableSet.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

File 18 of 20 : EnumerableMap.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @dev Library for managing an enumerable variant of Solidity's
 * https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`]
 * type.
 *
 * Maps have the following properties:
 *
 * - Entries are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Entries are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableMap for EnumerableMap.UintToAddressMap;
 *
 *     // Declare a set state variable
 *     EnumerableMap.UintToAddressMap private myMap;
 * }
 * ```
 *
 * As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are
 * supported.
 */
library EnumerableMap {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Map type with
    // bytes32 keys and values.
    // The Map implementation uses private functions, and user-facing
    // implementations (such as Uint256ToAddressMap) are just wrappers around
    // the underlying Map.
    // This means that we can only create new EnumerableMaps for types that fit
    // in bytes32.

    struct MapEntry {
        bytes32 _key;
        bytes32 _value;
    }

    struct Map {
        // Storage of map keys and values
        MapEntry[] _entries;

        // Position of the entry defined by a key in the `entries` array, plus 1
        // because index 0 means a key is not in the map.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function _set(Map storage map, bytes32 key, bytes32 value) private returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex == 0) { // Equivalent to !contains(map, key)
            map._entries.push(MapEntry({ _key: key, _value: value }));
            // The entry is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            map._indexes[key] = map._entries.length;
            return true;
        } else {
            map._entries[keyIndex - 1]._value = value;
            return false;
        }
    }

    /**
     * @dev Removes a key-value pair from a map. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function _remove(Map storage map, bytes32 key) private returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex != 0) { // Equivalent to contains(map, key)
            // To delete a key-value pair from the _entries array in O(1), we swap the entry to delete with the last one
            // in the array, and then remove the last entry (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = keyIndex - 1;
            uint256 lastIndex = map._entries.length - 1;

            // When the entry to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            MapEntry storage lastEntry = map._entries[lastIndex];

            // Move the last entry to the index where the entry to delete is
            map._entries[toDeleteIndex] = lastEntry;
            // Update the index for the moved entry
            map._indexes[lastEntry._key] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved entry was stored
            map._entries.pop();

            // Delete the index for the deleted slot
            delete map._indexes[key];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function _contains(Map storage map, bytes32 key) private view returns (bool) {
        return map._indexes[key] != 0;
    }

    /**
     * @dev Returns the number of key-value pairs in the map. O(1).
     */
    function _length(Map storage map) private view returns (uint256) {
        return map._entries.length;
    }

   /**
    * @dev Returns the key-value pair stored at position `index` in the map. O(1).
    *
    * Note that there are no guarantees on the ordering of entries inside the
    * array, and it may change when more entries are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Map storage map, uint256 index) private view returns (bytes32, bytes32) {
        require(map._entries.length > index, "EnumerableMap: index out of bounds");

        MapEntry storage entry = map._entries[index];
        return (entry._key, entry._value);
    }

    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     */
    function _tryGet(Map storage map, bytes32 key) private view returns (bool, bytes32) {
        uint256 keyIndex = map._indexes[key];
        if (keyIndex == 0) return (false, 0); // Equivalent to contains(map, key)
        return (true, map._entries[keyIndex - 1]._value); // All indexes are 1-based
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function _get(Map storage map, bytes32 key) private view returns (bytes32) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, "EnumerableMap: nonexistent key"); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    /**
     * @dev Same as {_get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {_tryGet}.
     */
    function _get(Map storage map, bytes32 key, string memory errorMessage) private view returns (bytes32) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, errorMessage); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    // UintToAddressMap

    struct UintToAddressMap {
        Map _inner;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(UintToAddressMap storage map, uint256 key, address value) internal returns (bool) {
        return _set(map._inner, bytes32(key), bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function remove(UintToAddressMap storage map, uint256 key) internal returns (bool) {
        return _remove(map._inner, bytes32(key));
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function contains(UintToAddressMap storage map, uint256 key) internal view returns (bool) {
        return _contains(map._inner, bytes32(key));
    }

    /**
     * @dev Returns the number of elements in the map. O(1).
     */
    function length(UintToAddressMap storage map) internal view returns (uint256) {
        return _length(map._inner);
    }

   /**
    * @dev Returns the element stored at position `index` in the set. O(1).
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintToAddressMap storage map, uint256 index) internal view returns (uint256, address) {
        (bytes32 key, bytes32 value) = _at(map._inner, index);
        return (uint256(key), address(uint160(uint256(value))));
    }

    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     *
     * _Available since v3.4._
     */
    function tryGet(UintToAddressMap storage map, uint256 key) internal view returns (bool, address) {
        (bool success, bytes32 value) = _tryGet(map._inner, bytes32(key));
        return (success, address(uint160(uint256(value))));
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(UintToAddressMap storage map, uint256 key) internal view returns (address) {
        return address(uint160(uint256(_get(map._inner, bytes32(key)))));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryGet}.
     */
    function get(UintToAddressMap storage map, uint256 key, string memory errorMessage) internal view returns (address) {
        return address(uint160(uint256(_get(map._inner, bytes32(key), errorMessage))));
    }
}

File 19 of 20 : IERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.7.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

File 20 of 20 : UsingHelpers.sol
// SPDX-License-Identifier: LGPL-3.0-or-later

pragma solidity 0.7.6;

// Those are the payment methods we are using throughout the system.
// Depending on how to user choose to interact with it's funds we store the method, so we could distribute its tokens afterwise
enum PaymentMethod {
    ETHETH,
    ETHTKN,
    TKNETH,
    TKNTKN
}

enum Entity {ISSUER, HOLDER, POOL}

enum VoucherState {FINAL, CANCEL_FAULT, COMPLAIN, EXPIRE, REFUND, REDEEM, COMMIT}
/*  Status of the voucher in 8 bits:
    [6:COMMITTED] [5:REDEEMED] [4:REFUNDED] [3:EXPIRED] [2:COMPLAINED] [1:CANCELORFAULT] [0:FINAL]
*/

enum Condition {NOT_SET, BALANCE, OWNERSHIP} //Describes what kind of condition must be met for a conditional commit

struct ConditionalCommitInfo {
    uint256 conditionalTokenId;
    uint256 threshold;
    Condition condition;
    address gateAddress;
    bool registerConditionalCommit;
}

uint8 constant ONE = 1;

struct VoucherDetails {
    uint256 tokenIdSupply;
    uint256 tokenIdVoucher;
    address issuer;
    address holder;
    uint256 price;
    uint256 depositSe;
    uint256 depositBu;
    PaymentMethod paymentMethod;
    VoucherStatus currStatus;
}

struct VoucherStatus {
    address seller;
    uint8 status;
    bool isPaymentReleased;
    bool isDepositsReleased;
    DepositsReleased depositReleased;
    uint256 complainPeriodStart;
    uint256 cancelFaultPeriodStart;
}

struct DepositsReleased {
    uint8 status;
    uint248 releasedAmount;
}

/**
    * @notice Based on its lifecycle, voucher can have many different statuses. Checks whether a voucher is in Committed state.
    * @param _status current status of a voucher.
    */
function isStateCommitted(uint8 _status) pure returns (bool) {
    return _status == determineStatus(0, VoucherState.COMMIT);
}

/**
    * @notice Based on its lifecycle, voucher can have many different statuses. Checks whether a voucher is in RedemptionSigned state.
    * @param _status current status of a voucher.
    */
function isStateRedemptionSigned(uint8 _status)
    pure
    returns (bool)
{
    return _status == determineStatus(determineStatus(0, VoucherState.COMMIT), VoucherState.REDEEM);
}

/**
    * @notice Based on its lifecycle, voucher can have many different statuses. Checks whether a voucher is in Refunded state.
    * @param _status current status of a voucher.
    */
function isStateRefunded(uint8 _status) pure returns (bool) {
    return _status == determineStatus(determineStatus(0, VoucherState.COMMIT), VoucherState.REFUND);
}

/**
    * @notice Based on its lifecycle, voucher can have many different statuses. Checks whether a voucher is in Expired state.
    * @param _status current status of a voucher.
    */
function isStateExpired(uint8 _status) pure returns (bool) {
    return _status == determineStatus(determineStatus(0, VoucherState.COMMIT), VoucherState.EXPIRE);
}

/**
    * @notice Based on its lifecycle, voucher can have many different statuses. Checks the current status a voucher is at.
    * @param _status current status of a voucher.
    * @param _idx status to compare.
    */
function isStatus(uint8 _status, VoucherState _idx) pure returns (bool) {
    return (_status >> uint8(_idx)) & ONE == 1;
}

/**
    * @notice Set voucher status.
    * @param _status previous status.
    * @param _changeIdx next status.
    */
function determineStatus(uint8 _status, VoucherState _changeIdx)
    pure
    returns (uint8)
{
    return _status | (ONE << uint8(_changeIdx));
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"string","name":"baseURI_","type":"string"},{"internalType":"string","name":"name_","type":"string"},{"internalType":"string","name":"symbol_","type":"string"},{"internalType":"address","name":"_cashierAddress","type":"address"},{"internalType":"address","name":"_voucherKernelAddress","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"_newCashier","type":"address"},{"indexed":false,"internalType":"address","name":"_triggeredBy","type":"address"}],"name":"LogCashierSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"string","name":"_contractUri","type":"string"},{"indexed":false,"internalType":"address","name":"_triggeredBy","type":"address"}],"name":"LogContractUriSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"string","name":"_newUri","type":"string"},{"indexed":false,"internalType":"address","name":"_triggeredBy","type":"address"}],"name":"LogUriSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"_newVoucherKernel","type":"address"},{"indexed":false,"internalType":"address","name":"_triggeredBy","type":"address"}],"name":"LogVoucherKernelSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"baseURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"contractURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getCashierAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getVoucherKernelAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"mint","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_from","type":"address"},{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_cashierAddress","type":"address"}],"name":"setCashierAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_contractUri","type":"string"}],"name":"setContractUri","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_newUri","type":"string"}],"name":"setTokenURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_voucherKernelAddress","type":"address"}],"name":"setVoucherKernelAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_from","type":"address"},{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

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

-----Decoded View---------------
Arg [0] : baseURI_ (string): https://metadata.bosonprotocol.io/vouchers/
Arg [1] : name_ (string): Boson Smart Voucher
Arg [2] : symbol_ (string): BSV
Arg [3] : _cashierAddress (address): 0x244154F58e9Bf6C15c3a09846eFB7bEcFe92A880
Arg [4] : _voucherKernelAddress (address): 0x19c10A47C9356eFD0E4377411Db627636Ee9E3C6

-----Encoded View---------------
12 Constructor Arguments found :
Arg [0] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000100
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000140
Arg [3] : 000000000000000000000000244154f58e9bf6c15c3a09846efb7becfe92a880
Arg [4] : 00000000000000000000000019c10a47c9356efd0e4377411db627636ee9e3c6
Arg [5] : 000000000000000000000000000000000000000000000000000000000000002b
Arg [6] : 68747470733a2f2f6d657461646174612e626f736f6e70726f746f636f6c2e69
Arg [7] : 6f2f766f7563686572732f000000000000000000000000000000000000000000
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000013
Arg [9] : 426f736f6e20536d61727420566f756368657200000000000000000000000000
Arg [10] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [11] : 4253560000000000000000000000000000000000000000000000000000000000


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A token is a representation of an on-chain or off-chain asset. The token page shows information such as price, total supply, holders, transfers and social links. Learn more about this page in our Knowledge Base.