Contract Source Code (Solidity)

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Outline

• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(
•  contract PaymentContract *
•    - function setTokenAddress(address _new ...
•    - function setPaymentAmount(uint256 _ne ...
•    - function pay()

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/**
 *Submitted for verification at Etherscan.io on 2024-05-29
*/

// SPDX-License-Identifier: MIT
// File: @openzeppelin/[email protected]/token/ERC20/IERC20.sol



pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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);
}

// File: contracts/GRDNPay.sol


pragma solidity ^0.8.0;


contract PaymentContract {
    address public owner;
    IERC20 public grdnToken;
    uint256 public paymentAmount;

    // Sự kiện khi thanh toán thành công
    event PaymentReceived(address indexed from, uint256 amount);
    
    // Sự kiện khi thay đổi địa chỉ token GRDN
    event TokenAddressChanged(address indexed newTokenAddress);

    constructor(address _grdnTokenAddress, uint256 _paymentAmount) {
        owner = msg.sender;
        grdnToken = IERC20(_grdnTokenAddress);
        paymentAmount = _paymentAmount;
    }

    // Hàm để thay đổi địa chỉ token GRDN
    function setTokenAddress(address _newTokenAddress) external {
        require(msg.sender == owner, "Only owner can set the token address");
        grdnToken = IERC20(_newTokenAddress);
        emit TokenAddressChanged(_newTokenAddress);
    }

    // Hàm để thay đổi số lượng token cần thanh toán
    function setPaymentAmount(uint256 _newAmount) external {
        require(msg.sender == owner, "Only owner can set the payment amount");
        paymentAmount = _newAmount;
    }

    // Hàm để thực hiện thanh toán
    function pay() external {
        require(grdnToken.transferFrom(msg.sender, owner, paymentAmount), "Token transfer failed");
        emit PaymentReceived(msg.sender, paymentAmount);
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_grdnTokenAddress","type":"address"},{"internalType":"uint256","name":"_paymentAmount","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"PaymentReceived","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"newTokenAddress","type":"address"}],"name":"TokenAddressChanged","type":"event"},{"inputs":[],"name":"grdnToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pay","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paymentAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_newAmount","type":"uint256"}],"name":"setPaymentAmount","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newTokenAddress","type":"address"}],"name":"setTokenAddress","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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