ERC20支付处理

Question

我的智能合约出了什么问题，因为我收到“错误：无法估计气体；交易可能失败或可能需要手动气体限制”。在前端，我先调用 approveTokens() 然后再调用 acceptPayment()

pragma solidity ^0.8.11;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';

contract PaymentProcessor {
   address public owner;
   IERC20 public token;

constructor(address _owner, address _token) {
    owner = _owner;
    token = IERC20(_token);
}

event PaymentCompleted(
    address payer,
    uint256 amount,
    uint paymentId,
    uint timestamp
);

function approveTokens(uint256 amount) public returns(bool){
   token.approve(owner, amount);
   return true;
}

function getAllowance() public view returns(uint256){
    return token.allowance(msg.sender, owner);
}

function acceptPayment(uint256 amount, uint paymentId) payable public {
    require(amount > getAllowance(), "Please approve tokens before transferring");
    token.transfer(owner, amount);

    emit PaymentCompleted(msg.sender, amount, paymentId, block.timestamp);
}

}

Answer 1

用户需要直接在 token 地址上调用 approve()，而不是通过您的合约。

您当前的实施批准 owner 花费 PaymentProcessor 的代币，因为 PaymentProcessor 是 token 合同上下文中的 msg.sender。

ERC20支付处理

ERC20 Payment processing

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