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// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

import "@chainlink/contracts/src/v0.8/interfaces/VRFCoordinatorV2Interface.sol";
import "@chainlink/contracts/src/v0.8/VRFConsumerBaseV2.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";

///@dev uniswap Factory interface to call createPair in constructor
interface IUniswapV2Factory {
    event PairCreated(
        address indexed token0,
        address indexed token1,
        address pair,
        uint256
    );

    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);
}

///@dev uniswap router interface to call swapTokensForETH and getting WETH, factory value
interface IUniswapV2Router02 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

///@dev wrapper to handle the rewardPool
///@notice rewardFundHandler is a wrapper smartcontract to manage reward pool funds,
/// 95% of funds will be sent to winner and 5% to fee wallet to keep the 
/// chainlink vrf working. (5% fee is deducted in eth, which owner can use 
/// to buy LINK token and fill the Subscription). 

contract rewardFundHanlder is Ownable {
     uint256 public totalDistributed; //keep track of total rewards distributed till date
     address public wallet = address(0xa9a72d15842A239B0D2fD62009239D77abCb7857);  // fee wallet
     

  ///@dev send rewards to the winner
  ///@param winner: address of winner, which will be set by token contract 
  /// itself, as per chainlink VRF outcome.
  function sendRewardToWinner (address winner) external onlyOwner {
    uint256 balance = address(this).balance;
    uint256 winnerPart = (balance * 95) /100; //95% goes to winner
    uint256 chainlinkFee = balance - winnerPart; // 5% will be used to cover up chainlink VRF gas
    (bool sent,) = winner.call{value: winnerPart} ("");
    require (sent, "reward transfer failed");
    (bool cFee,) = wallet.call{value: chainlinkFee}("");
    require(cFee, "chainlink fee transfer failed");
    totalDistributed += balance;
  }

  ///@dev update the fee wallet to new one
  ///@param _newWallet: new wallet address to receive the fees.
  function updateWallet (address _newWallet) external onlyOwner {
    require (_newWallet != address(0), "can't be a zero address");
    wallet = _newWallet;
  }

  

  ///@notice receive any external eth
  receive() external payable {}

}

///@title WojakpotToken
///@notice An ERC20 token implementing buy/sell fee and reward mechanism for traders
///@dev contract uses Chainlink VRF V2 to generate randomness 
///@dev Chainlink VRF V2 -- 0x271682DEB8C4E0901D1a1550aD2e64D568E69909
///@dev make sure owner has set subscription id and it's live. 
///@dev subscription should be funded enough to call pick winner successfully

contract WojakpotToken is ERC20, Ownable, VRFConsumerBaseV2, ReentrancyGuard {
                
                ///dex and wallet related variables//
    IUniswapV2Router02 public immutable uniswapV2Router;
    address public immutable uniswapV2Pair;
    address public constant deadAddress = address(0x000000000000000000000000000000000000dEaD);
            
    bool private swapping;
    address public marketingAndTeamWallet;
    rewardFundHanlder private rewardFundManager;
    address public rewardHandlingWrapper;

    uint256 public swapTokensAtAmount;
    bool public tradingActive = false;
              
              ///fees///
    uint256 public marketingAndTeamFeeBuy;
    uint256 public rewardFeeBuy;

    uint256 public marketingAndTeamFeeSell;
    uint256 public rewardFeeSell;

    uint256 private totalBuyFee;
    uint256 private totalSellFee;


     ///reward related variables///
    uint256 public lastDistributed;
    uint256 public minHoldingAmount;
    uint256 private requestID;
    uint256 public INTERVAL = 86400 seconds; // 1 Day
    


           /// winners, users and recent winner variables///
    address [] public winners;
    address[] public _participants;
    address public recentWinner;
    

               ///Chainlink vrf v2 setup///
    uint64 private immutable i_subscriptionId;
    uint32 private immutable i_callbackGasLimit;
    uint32 private constant NUM_WORDS = 1;
    uint16 private constant REQUEST_CONFIRMATIONS = 3;
    VRFCoordinatorV2Interface private immutable i_vrfCoordinator;
    bytes32 private immutable i_keyHash;
    

                ///mappings///   

    mapping(address => bool) private _isExcludedFromFees; // manage excluding of address from fee
    mapping(address => bool) public _isExcludedFromRewardPool; // managing the excluding of user from reward pool
    mapping(address => bool) public isEligible; // true if user is in list, false if not
    mapping(address => uint256) public participantIndex; //index of user in list
    mapping(address => bool) public marketMakerPairs; // pairs for token

    
               ///Events///

    event ExcludeFromFees(address indexed account, bool isExcluded);

    event marketingAndTeamWalletsUpdated(
        address indexed marketingAndTeamWallet
    );

    event WinnerPicked(address indexed user, uint256 ethAmount);

    event NewPairAdded (address indexed newPair);

    event TokensClaimed (address indexed token, uint256 amount);
    event EthClaimed (address indexed wallet, uint256 amount);
    event TradingEnabled (uint256 indexed startTime);
    event SwapAmountUpdated(uint256 indexed amount);
    event BuyFeesUpdated (uint256 indexed marketingAndTeamFee, uint256 indexed rewardPoolFee);
    event SellFeesUpdated (uint256 indexed marketingAndTeamFee, uint256 indexed rewardPoolFee);
    event RewardFeeWalletUpdated (address indexed feeWallet);
    event IntervalUpdated(uint256 indexed newInterval);

    constructor(uint64 _subscriptionID) ERC20("Wojakpot", "WJP") VRFConsumerBaseV2(0x271682DEB8C4E0901D1a1550aD2e64D568E69909) {
                          

                           ///VRF setup///
        i_vrfCoordinator = VRFCoordinatorV2Interface(0x271682DEB8C4E0901D1a1550aD2e64D568E69909);
        i_keyHash = 0x8af398995b04c28e9951adb9721ef74c74f93e6a478f39e7e0777be13527e7ef; //200 gwei keyhash
        i_subscriptionId = _subscriptionID; // you can create one on https://vrf.chain.link/
        i_callbackGasLimit = 300000;

                           ///Uniswap Setup///
         IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(
           0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D  // Uniswap V2 Router
        );
        uniswapV2Router = _uniswapV2Router;
        uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());
        marketMakerPairs[address(uniswapV2Pair)] = true;
        rewardFundManager = new rewardFundHanlder();  
        rewardHandlingWrapper = address(rewardFundManager);  

                        ///Token Config///
        uint256 totalSupply = 1000000000 * 1e9; // 1 billion supply

        swapTokensAtAmount = 100000 * 1e9; //swap tax for eth when collected tokens are 100000 or more
        minHoldingAmount = 100000 * 1e9; // 100000 tokens to become eligible for reward pool

        marketingAndTeamFeeSell = 10; //1%
        rewardFeeSell = 20; // 2%
        totalSellFee = marketingAndTeamFeeSell + rewardFeeSell;

        marketingAndTeamFeeBuy = 10; // 1%
        rewardFeeBuy = 20; //2%

        totalBuyFee = marketingAndTeamFeeBuy + rewardFeeBuy;

        marketingAndTeamWallet = address(0x6B9D2d366FAEC27012cB650a6Ff9d58603Fc261E); // marketing wallet


        // exclude from paying fees
        _isExcludedFromFees[owner()] = true;
        _isExcludedFromFees[marketingAndTeamWallet] = true;
        _isExcludedFromFees[address(this)] = true;
        _isExcludedFromFees[deadAddress] = true;
       

        /*
            _mint is an internal function in ERC20.sol that is only called here,
            and CANNOT be called ever again
        */
        _mint(msg.sender, totalSupply);
    }

    receive() external payable {}

    function decimals() public view virtual override returns (uint8) {
        return 9;
    }

    ///@dev  enabled trading, once enabled can't be reversed
    function enableTrading() external onlyOwner {
        require(!tradingActive, "trading is already live");
        tradingActive = true;
        lastDistributed = block.timestamp;
        emit TradingEnabled(lastDistributed);
    }


    ///@dev change the minimum amount of tokens to sell from fees
    ///@param newAmount: new amount for swapping tokens to eth
    /// requirements --
    /// must be greator than equal to 1000 tokens and less
    /// than 0.5% of the supply
    function updateSwapTokensAtAmount(uint256 newAmount)
        external
        onlyOwner
        returns (bool)
    {
        require(
            newAmount >= 1000 * 1e9,
            "Swap amount cannot be lower than 1000 tokens."
        );
        require(
            newAmount <= (totalSupply() * 5) / 1000,
            "Swap amount cannot be higher than 0.5% total supply."
        );
        swapTokensAtAmount = newAmount;
        emit SwapAmountUpdated (newAmount);
        return true;
        
    }

    ///@dev update the fees for sell tax
    ///@param marketingAndTeam: set new marketingAndTeam fees for sell
    ///@param rewardPool: set new reward fees for sell
    ///@notice As divisor is 1000 for calculation, so 5 means 0.5% and 10 means 1%
    function updateSellFees(
        uint256 marketingAndTeam,
        uint256 rewardPool
    ) external onlyOwner {
        marketingAndTeamFeeSell = marketingAndTeam;
        rewardFeeSell = rewardPool;
        totalSellFee = marketingAndTeamFeeSell + rewardFeeSell;
        require(totalSellFee >= 10 && totalSellFee <= 50, "Sell tax too high");
        emit SellFeesUpdated(marketingAndTeam, rewardPool);
    }
    

    ///@dev update the fees for buy tax
    ///@param marketingAndTeam: set new marketingAndTeam fees for buy
    ///@param rewardPool: set new reward fees for buy
    ///@notice As divisor is 1000 for calculation, so 5 means 0.5% and 10 means 1%
     function updateBuyFees(
        uint256 marketingAndTeam,
        uint256 rewardPool
    ) external onlyOwner {
        marketingAndTeamFeeBuy = marketingAndTeam;
        rewardFeeBuy = rewardPool;
        totalBuyFee = marketingAndTeamFeeBuy + rewardFeeBuy;
        require( totalBuyFee >= 10 && totalBuyFee <= 50, "Buy tax too high");
        emit BuyFeesUpdated(marketingAndTeam, rewardPool);
    }

    ///@dev manage the users address for having fees or not
    ///@param account: user address which will be excluded or included
    ///@param excluded: boolean value, true means excluded from fees, false means included in fees 
    function excludeFromFees(address account, bool excluded) external onlyOwner {
       require(account != address(0), "zero address not allowed"); 
       if (excluded) {
           require (!_isExcludedFromFees[account],"account is already excluded from fees");
        }
       if (!excluded) {
           require(_isExcludedFromFees[account],"account is already included in fees");
        }
        _isExcludedFromFees[account] = excluded;
        emit ExcludeFromFees(account, _isExcludedFromFees[account]);
    }

    ///@dev update marketing wallet address
    ///@param newWallet: new address to receive marketing fess
    function updateMarketingWallet(address newWallet)
        external
        onlyOwner
    {
       require(newWallet != address(0), "address zero not allowed");
       require (!isContract(newWallet),"Contract not allowed");
        marketingAndTeamWallet = newWallet;
         emit marketingAndTeamWalletsUpdated(newWallet);
    }

    ///@notice check if a address is contract or not
    function isContract(address addr) private view returns (bool) {
      uint size;
      assembly { size := extcodesize(addr) }
       return size > 0;
     }

    ///@dev udpate the fee wallet to cover the chainlink fee
    ///@param wallet: new wallet to receive 5% eth when winner is picked
    function updateFeeWallet (address wallet) external onlyOwner {
        require(wallet != address(0), "address zero not allowed");
        require (!isContract(wallet),"contract not allowed");
        rewardFundManager.updateWallet(wallet);
        emit RewardFeeWalletUpdated (wallet);
    }


    ///@dev claim any tokens from token contract
    ///@param token: token address to be rescued.
    ///Requirements: 
    ///Can't claim native tokens
    function claimStuckedERC20(address token) external onlyOwner {
        require (token != address(this), "can't take out native token");
        uint256 amount = IERC20(token).balanceOf(address(this));
        if(amount > 0){
        IERC20(token).transfer(owner(), amount);
        emit TokensClaimed(token, amount);
        }
    }

    ///@dev claim any dust or external ether from the token contract
    function claimETH () external onlyOwner {
        uint256 amount = address(this).balance;
     (bool sent,)= owner().call{value: amount}("");
     require (sent, "ETH transfer failed");
     emit EthClaimed(owner(), amount);
    }
    
    

    ///@notice Returns if an account is excluded from fees/limits or not
    function isExcludedFromFees(address account) public view returns (bool) {
        return _isExcludedFromFees[account];
    }

    ///@dev add or remove new pairs for token
    ///@param newPair: new pair address to be added or removed
    ///@param value: true to add, false to remove.
    /// Requirements --
    /// can't remove the main pair.
    function manageMarketMakerPair (address newPair, bool value) external onlyOwner {
        require (newPair != address(uniswapV2Pair), "can't remove main pair");
        marketMakerPairs[newPair] = value;
        if(value == true) {
            emit NewPairAdded(newPair);
        }
    }

    ///@notice transfer function to determine if it's a buy or sell
    /// or just a transfer. and implements maxWallet, maxTx accordingly.
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal override {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        if (amount == 0) {
            super._transfer(from, to, 0);
            return;
        }

        
            if (
                from != owner() &&
                to != owner() &&
                to != address(0) &&
                to != address(0x000000000000000000000000000000000000dEaD) &&
                !swapping
            ) {
                if (!tradingActive) {
                    require(
                        _isExcludedFromFees[from] || _isExcludedFromFees[to],
                        "Trading is not active."
                    );
                }

            }


        uint256 contractTokenBalance = balanceOf(address(this));

        bool canSwap = contractTokenBalance >= swapTokensAtAmount;

        if (
            canSwap &&
            !swapping &&
            marketMakerPairs[to] &&
            !_isExcludedFromFees[from] &&
            !_isExcludedFromFees[to]
        ) {
            swapping = true;

            swapBack();

            swapping = false;
        }

        bool takeFee = !swapping;

        // if any account belongs to _isExcludedFromFee account then remove the fee
        if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
            takeFee = false;
        }

        uint256 fees = 0;
        // only take fees on buys/sells, do not take on wallet transfers
        if (takeFee) {
            // on sell
            if (marketMakerPairs[to] && totalSellFee > 0) {
                fees = (amount * totalSellFee) / 1000;
            }
            // on buy
            if (marketMakerPairs[from] && totalBuyFee > 0) {
                fees = (amount * totalBuyFee) / 1000;
            }

            if (fees > 0) {
                super._transfer(from, address(this), fees);
            }

            amount -= fees;
        }
        
        

        super._transfer(from, to, amount);

                             /// adding and removing participants for reward Pool logic
         if (!_isExcludedFromRewardPool[from] && balanceOf(from) < minHoldingAmount && isEligible[from]){ 
            removeholderFromList(from);
             }
             
         if (!_isExcludedFromRewardPool[to] && balanceOf(to) >= minHoldingAmount && !isEligible[to] && !marketMakerPairs[to] && to!=deadAddress && to!= address(0)){ 
            addHolderToList(to); 
            }
    }

      ///@dev pick winner, can be called by anyone, chainlink automation
      /// requirements --
      /// rewardPool balance  should be greator than 0.
      ///check if time b/w last reward distribution and now is more than INTERVAL, pickWinner
      function pickWinner () public nonReentrant{
        require (address(rewardFundManager).balance > 0, "reward pool don't have enough eth");
        require (block.timestamp - lastDistributed > INTERVAL, "Enough time has not been passed yet");
        uint256 reward = rewardHandlingWrapper.balance;
        _pickWinner();
         lastDistributed = block.timestamp;
         address winner = recentWinner;
         emit WinnerPicked(winner, reward);
         
      }

                       
                       ///                       ///
                      ///   INTERNAL FUNCTIONS  ///  
                     ///                       ///

    ///@notice request  chainlink coordinator for randomness
    function _pickWinner () internal {
        requestID = i_vrfCoordinator.requestRandomWords(
            i_keyHash,
            i_subscriptionId, // contract that will fund subscription requests
            REQUEST_CONFIRMATIONS,
            i_callbackGasLimit,
            NUM_WORDS
        );
    }

    ///@notice value returned by chainlink coordinator is used to decided the winner
    /// and winner got paid.
     function fulfillRandomWords(
        uint256, /*request_id */
        uint256[] memory randomWords
    ) internal override {
        uint256 indexWinner = randomWords[0] % _participants.length;
        address recentWinnerChoosen = _participants[indexWinner];
        recentWinner = recentWinnerChoosen;
        rewardFundManager.sendRewardToWinner(recentWinner);
        
    }

    
     function addHolderToList(address holder) internal {
        participantIndex[holder] = _participants.length;
        _participants.push(holder);
        isEligible[holder] = true;
    }

    function removeholderFromList(address holder) internal {
        _participants[participantIndex[holder]] = _participants[_participants.length-1];
        participantIndex[_participants[_participants.length-1]] = participantIndex[holder];
        _participants.pop();
        isEligible[holder] = false;
    }

    function swapTokensForETH(uint256 tokenAmount) private {
        // generate the uniswap pair path of token -> weth
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

        _approve(address(this), address(uniswapV2Router), tokenAmount);

        // make the swap
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            address(this),
            block.timestamp
        );
    }

     /// manage the swap the tax tokens for eth and send to marketing wallet, rewardPool
     /// as per there share.
    function swapBack() public {
        uint256 contractBalance = balanceOf(address(this));
        if (contractBalance == 0) {
            return;
        }
        uint256 oldBalance = address(this).balance;
        swapTokensForETH(contractBalance);
        uint256 newBalance = address(this).balance - oldBalance;
        uint256 marketingAndTeamShare = (newBalance * (marketingAndTeamFeeBuy + marketingAndTeamFeeSell)) / (totalBuyFee+totalSellFee);
        uint256 rewardShare = newBalance - marketingAndTeamShare;
        
        (bool success,) = marketingAndTeamWallet.call{value: marketingAndTeamShare}("");
        (bool success1,) = rewardHandlingWrapper.call{value: rewardShare}("");
        require (success, "eth to marketing wallet failed");
        require (success1, "eth to reward pool failed");
       


    }

    ///@notice returns total eth distributed till date (it includes fees as well)
    function totalDistributedTillDate () public view returns (uint256) {
        return rewardFundManager.totalDistributed();
    }
    
    ///@dev set minimum time interval b/w picking winner again
    ///@param newInterval: input in days, 1 means 1 days
    ///requirements --
    /// value should be b/w 1 and 30.
    function setInterval (uint256 newInterval) external onlyOwner {
        require (newInterval > 1 seconds && newInterval <= 2592000 seconds, "interval should be b/w 1 sec to 30 days");
        INTERVAL = newInterval * 1 seconds;
        emit IntervalUpdated (newInterval);
    }


}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

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() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

/** ****************************************************************************
 * @notice Interface for contracts using VRF randomness
 * *****************************************************************************
 * @dev PURPOSE
 *
 * @dev Reggie the Random Oracle (not his real job) wants to provide randomness
 * @dev to Vera the verifier in such a way that Vera can be sure he's not
 * @dev making his output up to suit himself. Reggie provides Vera a public key
 * @dev to which he knows the secret key. Each time Vera provides a seed to
 * @dev Reggie, he gives back a value which is computed completely
 * @dev deterministically from the seed and the secret key.
 *
 * @dev Reggie provides a proof by which Vera can verify that the output was
 * @dev correctly computed once Reggie tells it to her, but without that proof,
 * @dev the output is indistinguishable to her from a uniform random sample
 * @dev from the output space.
 *
 * @dev The purpose of this contract is to make it easy for unrelated contracts
 * @dev to talk to Vera the verifier about the work Reggie is doing, to provide
 * @dev simple access to a verifiable source of randomness. It ensures 2 things:
 * @dev 1. The fulfillment came from the VRFCoordinator
 * @dev 2. The consumer contract implements fulfillRandomWords.
 * *****************************************************************************
 * @dev USAGE
 *
 * @dev Calling contracts must inherit from VRFConsumerBase, and can
 * @dev initialize VRFConsumerBase's attributes in their constructor as
 * @dev shown:
 *
 * @dev   contract VRFConsumer {
 * @dev     constructor(<other arguments>, address _vrfCoordinator, address _link)
 * @dev       VRFConsumerBase(_vrfCoordinator) public {
 * @dev         <initialization with other arguments goes here>
 * @dev       }
 * @dev   }
 *
 * @dev The oracle will have given you an ID for the VRF keypair they have
 * @dev committed to (let's call it keyHash). Create subscription, fund it
 * @dev and your consumer contract as a consumer of it (see VRFCoordinatorInterface
 * @dev subscription management functions).
 * @dev Call requestRandomWords(keyHash, subId, minimumRequestConfirmations,
 * @dev callbackGasLimit, numWords),
 * @dev see (VRFCoordinatorInterface for a description of the arguments).
 *
 * @dev Once the VRFCoordinator has received and validated the oracle's response
 * @dev to your request, it will call your contract's fulfillRandomWords method.
 *
 * @dev The randomness argument to fulfillRandomWords is a set of random words
 * @dev generated from your requestId and the blockHash of the request.
 *
 * @dev If your contract could have concurrent requests open, you can use the
 * @dev requestId returned from requestRandomWords to track which response is associated
 * @dev with which randomness request.
 * @dev See "SECURITY CONSIDERATIONS" for principles to keep in mind,
 * @dev if your contract could have multiple requests in flight simultaneously.
 *
 * @dev Colliding `requestId`s are cryptographically impossible as long as seeds
 * @dev differ.
 *
 * *****************************************************************************
 * @dev SECURITY CONSIDERATIONS
 *
 * @dev A method with the ability to call your fulfillRandomness method directly
 * @dev could spoof a VRF response with any random value, so it's critical that
 * @dev it cannot be directly called by anything other than this base contract
 * @dev (specifically, by the VRFConsumerBase.rawFulfillRandomness method).
 *
 * @dev For your users to trust that your contract's random behavior is free
 * @dev from malicious interference, it's best if you can write it so that all
 * @dev behaviors implied by a VRF response are executed *during* your
 * @dev fulfillRandomness method. If your contract must store the response (or
 * @dev anything derived from it) and use it later, you must ensure that any
 * @dev user-significant behavior which depends on that stored value cannot be
 * @dev manipulated by a subsequent VRF request.
 *
 * @dev Similarly, both miners and the VRF oracle itself have some influence
 * @dev over the order in which VRF responses appear on the blockchain, so if
 * @dev your contract could have multiple VRF requests in flight simultaneously,
 * @dev you must ensure that the order in which the VRF responses arrive cannot
 * @dev be used to manipulate your contract's user-significant behavior.
 *
 * @dev Since the block hash of the block which contains the requestRandomness
 * @dev call is mixed into the input to the VRF *last*, a sufficiently powerful
 * @dev miner could, in principle, fork the blockchain to evict the block
 * @dev containing the request, forcing the request to be included in a
 * @dev different block with a different hash, and therefore a different input
 * @dev to the VRF. However, such an attack would incur a substantial economic
 * @dev cost. This cost scales with the number of blocks the VRF oracle waits
 * @dev until it calls responds to a request. It is for this reason that
 * @dev that you can signal to an oracle you'd like them to wait longer before
 * @dev responding to the request (however this is not enforced in the contract
 * @dev and so remains effective only in the case of unmodified oracle software).
 */
abstract contract VRFConsumerBaseV2 {
  error OnlyCoordinatorCanFulfill(address have, address want);
  address private immutable vrfCoordinator;

  /**
   * @param _vrfCoordinator address of VRFCoordinator contract
   */
  constructor(address _vrfCoordinator) {
    vrfCoordinator = _vrfCoordinator;
  }

  /**
   * @notice fulfillRandomness handles the VRF response. Your contract must
   * @notice implement it. See "SECURITY CONSIDERATIONS" above for important
   * @notice principles to keep in mind when implementing your fulfillRandomness
   * @notice method.
   *
   * @dev VRFConsumerBaseV2 expects its subcontracts to have a method with this
   * @dev signature, and will call it once it has verified the proof
   * @dev associated with the randomness. (It is triggered via a call to
   * @dev rawFulfillRandomness, below.)
   *
   * @param requestId The Id initially returned by requestRandomness
   * @param randomWords the VRF output expanded to the requested number of words
   */
  function fulfillRandomWords(uint256 requestId, uint256[] memory randomWords) internal virtual;

  // rawFulfillRandomness is called by VRFCoordinator when it receives a valid VRF
  // proof. rawFulfillRandomness then calls fulfillRandomness, after validating
  // the origin of the call
  function rawFulfillRandomWords(uint256 requestId, uint256[] memory randomWords) external {
    if (msg.sender != vrfCoordinator) {
      revert OnlyCoordinatorCanFulfill(msg.sender, vrfCoordinator);
    }
    fulfillRandomWords(requestId, randomWords);
  }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface VRFCoordinatorV2Interface {
  /**
   * @notice Get configuration relevant for making requests
   * @return minimumRequestConfirmations global min for request confirmations
   * @return maxGasLimit global max for request gas limit
   * @return s_provingKeyHashes list of registered key hashes
   */
  function getRequestConfig()
    external
    view
    returns (
      uint16,
      uint32,
      bytes32[] memory
    );

  /**
   * @notice Request a set of random words.
   * @param keyHash - Corresponds to a particular oracle job which uses
   * that key for generating the VRF proof. Different keyHash's have different gas price
   * ceilings, so you can select a specific one to bound your maximum per request cost.
   * @param subId  - The ID of the VRF subscription. Must be funded
   * with the minimum subscription balance required for the selected keyHash.
   * @param minimumRequestConfirmations - How many blocks you'd like the
   * oracle to wait before responding to the request. See SECURITY CONSIDERATIONS
   * for why you may want to request more. The acceptable range is
   * [minimumRequestBlockConfirmations, 200].
   * @param callbackGasLimit - How much gas you'd like to receive in your
   * fulfillRandomWords callback. Note that gasleft() inside fulfillRandomWords
   * may be slightly less than this amount because of gas used calling the function
   * (argument decoding etc.), so you may need to request slightly more than you expect
   * to have inside fulfillRandomWords. The acceptable range is
   * [0, maxGasLimit]
   * @param numWords - The number of uint256 random values you'd like to receive
   * in your fulfillRandomWords callback. Note these numbers are expanded in a
   * secure way by the VRFCoordinator from a single random value supplied by the oracle.
   * @return requestId - A unique identifier of the request. Can be used to match
   * a request to a response in fulfillRandomWords.
   */
  function requestRandomWords(
    bytes32 keyHash,
    uint64 subId,
    uint16 minimumRequestConfirmations,
    uint32 callbackGasLimit,
    uint32 numWords
  ) external returns (uint256 requestId);

  /**
   * @notice Create a VRF subscription.
   * @return subId - A unique subscription id.
   * @dev You can manage the consumer set dynamically with addConsumer/removeConsumer.
   * @dev Note to fund the subscription, use transferAndCall. For example
   * @dev  LINKTOKEN.transferAndCall(
   * @dev    address(COORDINATOR),
   * @dev    amount,
   * @dev    abi.encode(subId));
   */
  function createSubscription() external returns (uint64 subId);

  /**
   * @notice Get a VRF subscription.
   * @param subId - ID of the subscription
   * @return balance - LINK balance of the subscription in juels.
   * @return reqCount - number of requests for this subscription, determines fee tier.
   * @return owner - owner of the subscription.
   * @return consumers - list of consumer address which are able to use this subscription.
   */
  function getSubscription(uint64 subId)
    external
    view
    returns (
      uint96 balance,
      uint64 reqCount,
      address owner,
      address[] memory consumers
    );

  /**
   * @notice Request subscription owner transfer.
   * @param subId - ID of the subscription
   * @param newOwner - proposed new owner of the subscription
   */
  function requestSubscriptionOwnerTransfer(uint64 subId, address newOwner) external;

  /**
   * @notice Request subscription owner transfer.
   * @param subId - ID of the subscription
   * @dev will revert if original owner of subId has
   * not requested that msg.sender become the new owner.
   */
  function acceptSubscriptionOwnerTransfer(uint64 subId) external;

  /**
   * @notice Add a consumer to a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - New consumer which can use the subscription
   */
  function addConsumer(uint64 subId, address consumer) external;

  /**
   * @notice Remove a consumer from a VRF subscription.
   * @param subId - ID of the subscription
   * @param consumer - Consumer to remove from the subscription
   */
  function removeConsumer(uint64 subId, address consumer) external;

  /**
   * @notice Cancel a subscription
   * @param subId - ID of the subscription
   * @param to - Where to send the remaining LINK to
   */
  function cancelSubscription(uint64 subId, address to) external;

  /*
   * @notice Check to see if there exists a request commitment consumers
   * for all consumers and keyhashes for a given sub.
   * @param subId - ID of the subscription
   * @return true if there exists at least one unfulfilled request for the subscription, false
   * otherwise.
   */
  function pendingRequestExists(uint64 subId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^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 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

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

• No Contract Security Audit Submitted- Submit Audit Here

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0000000000000000000000000000000000000000000000000000000000000315

-----Decoded View---------------
Arg [0] : _subscriptionID (uint64): 789

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000315