Smart Contract Repository
Invoice

Invoice

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Verified
Ethereum
ADDRESS
0x34e158883efc81c5d92fde785fba48db738711ee
0x34e158883efc81c5d92fde785fba48db738711ee
Verified, Oracle, Router
Solidity
Verified
Ethereum
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https://www.alchemy.com/smart-contracts/invoice

Contract Information

The following smart contract is called Invoice and it is used to accept payments in either Ether or ERC20 tokens. It verifies the payment using a signature and stores the payment status in a mapping. The contract also allows the owner to withdraw the funds and change the signer address. The SafeERC20 library is used to perform safe transfers of ERC20 tokens.
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Invoice Source Code

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{"IERC20.sol":{"content":"pragma solidity ^0.4.23;\n\ncontract IERC20 {\n function totalSupply() public constant returns (uint);\n function balanceOf(address tokenOwner) public constant returns (uint balance);\n function allowance(address tokenOwner, address spender) public constant returns (uint remaining);\n function transfer(address to, uint tokens) public returns (bool success);\n function approve(address spender, uint tokens) public returns (bool success);\n function transferFrom(address from, address to, uint tokens) public returns (bool success);\n\n event Transfer(address indexed from, address indexed to, uint tokens);\n event Approval(address indexed tokenOwner, address indexed spender, uint tokens);\n}"},"Invoice.sol":{"content":"pragma solidity ^0.4.23;\n\nimport \"./IERC20.sol\";\nimport \"./SafeERC20.sol\";\n\ncontract Invoice {\n using SafeERC20 for IERC20;\n\n address public owner;\n address public quoteSigner;\n mapping(bytes32 =\u003e bool) public isPaid;\n\n event PaymentAccepted(bytes32 indexed hash, address indexed tokenContract, uint time, uint value);\n\n\n constructor(address valueSigner) public {\n owner = msg.sender;\n quoteSigner = valueSigner;\n }\n\n function isValidPayment(\n uint value,\n uint gasPrice,\n uint expiration,\n bytes32 payload,\n bytes32 hash,\n uint8 v,\n bytes32 r,\n bytes32 s,\n address tokenContract\n ) public view returns(bool valid) {\n bool isValid = !isPaid[payload];\n isValid = isValid \u0026\u0026 block.timestamp \u003c= expiration;\n bytes memory prefix = \"\\x19Ethereum Signed Message:\\n32\";\n bytes32 ourHash = keccak256(abi.encodePacked(value, gasPrice, expiration, payload, tokenContract));\n bytes32 payloadHash = keccak256(abi.encodePacked(prefix, ourHash));\n isValid = isValid \u0026\u0026 ourHash == hash;\n isValid = isValid \u0026\u0026 (ecrecover(payloadHash, v, r, s) == quoteSigner);\n return isValid;\n }\n\n function validatePayment(\n uint value,\n uint gasPrice,\n uint expiration,\n bytes32 payload,\n bytes32 hash,\n uint8 v,\n bytes32 r,\n bytes32 s,\n address tokenContract\n ) public view returns(bool valid) {\n require(isPaid[payload] == false, \"Already been paid\");\n require(block.timestamp \u003c= expiration, \"Payment is late\");\n bytes memory prefix = \"\\x19Ethereum Signed Message:\\n32\";\n bytes32 ourHash = keccak256(abi.encodePacked(value, gasPrice, expiration, payload, tokenContract));\n bytes32 payloadHash = keccak256(abi.encodePacked(prefix, ourHash));\n require(ourHash == hash, \"Hash mismatch\");\n require(ecrecover(payloadHash, v, r, s) == quoteSigner, \"Signature mismatch for quote\");\n return true;\n }\n\n\n function pay(\n uint value,\n uint gasPrice,\n uint expiration,\n bytes32 payload,\n bytes32 hash,\n uint8 v,\n bytes32 r,\n bytes32 s,\n address tokenContract\n ) public payable {\n if(tokenContract == 0x0) {\n require(validatePayment(msg.value, gasPrice, expiration, payload, hash, v, r, s, tokenContract), \"Only accept valid payments\");\n } else {\n IERC20 token = IERC20(tokenContract);\n require(token.allowance(msg.sender, address(this)) \u003e= value, \"Must have enough tokens to pay\");\n require(validatePayment(value, gasPrice, expiration, payload, hash, v, r, s, tokenContract), \"Only accept valid payments\");\n require(token.safeTransferFrom(msg.sender, address(this), value), \"Transfer must succeed\");\n }\n isPaid[payload] = true;\n emit PaymentAccepted(hash, tokenContract, block.timestamp, value);\n }\n\n modifier isAdmin() {\n require(msg.sender == owner, \"Must be the contract owner\");\n _;\n }\n\n function withdraw(address tokenContract) public isAdmin {\n if(tokenContract == 0x0) {\n owner.transfer(address(this).balance);\n } else {\n IERC20 token = IERC20(tokenContract);\n uint balance = token.balanceOf(address(this));\n require(token.safeTransfer(owner, balance), \"Must succeed withdrawing tokens\");\n }\n }\n\n function setSigner(address newQuoteSigner) public isAdmin {\n quoteSigner = newQuoteSigner;\n }\n function setAdmin(address newAdmin) public isAdmin {\n owner = newAdmin;\n }\n}\n"},"SafeERC20.sol":{"content":"pragma solidity ^0.4.23;\n\nimport \"./IERC20.sol\";\n/**\n* @dev Library to perform safe calls to standard method for ERC20 tokens.\n*\n* Why Transfers: transfer methods could have a return value (bool), throw or revert for insufficient funds or\n* unathorized value.\n*\n* Why Approve: approve method could has a return value (bool) or does not accept 0 as a valid value (BNB token).\n* The common strategy used to clean approvals.\n*\n* We use the Solidity call instead of interface methods because in the case of transfer, it will fail\n* for tokens with an implementation without returning a value.\n* Since versions of Solidity 0.4.22 the EVM has a new opcode, called RETURNDATASIZE.\n* This opcode stores the size of the returned data of an external call. The code checks the size of the return value\n* after an external call and reverts the transaction in case the return data is shorter than expected\n*/\nlibrary SafeERC20 {\n /**\n * @dev Transfer token for a specified address\n * @param _token erc20 The address of the ERC20 contract\n * @param _to address The address which you want to transfer to\n * @param _value uint256 the _value of tokens to be transferred\n * @return bool whether the transfer was successful or not\n */\n function safeTransfer(IERC20 _token, address _to, uint256 _value) internal returns (bool) {\n uint256 prevBalance = _token.balanceOf(address(this));\n\n if (prevBalance \u003c _value) {\n // Insufficient funds\n return false;\n }\n\n address(_token).call(\n abi.encodeWithSignature(\"transfer(address,uint256)\", _to, _value)\n );\n\n // Fail if the new balance its not equal than previous balance sub _value\n return prevBalance - _value == _token.balanceOf(address(this));\n }\n\n /**\n * @dev Transfer tokens from one address to another\n * @param _token erc20 The address of the ERC20 contract\n * @param _from address The address which you want to send tokens from\n * @param _to address The address which you want to transfer to\n * @param _value uint256 the _value of tokens to be transferred\n * @return bool whether the transfer was successful or not\n */\n function safeTransferFrom(\n IERC20 _token,\n address _from,\n address _to,\n uint256 _value\n ) internal returns (bool)\n {\n uint256 prevBalance = _token.balanceOf(_from);\n\n if (\n prevBalance \u003c _value || // Insufficient funds\n _token.allowance(_from, address(this)) \u003c _value // Insufficient allowance\n ) {\n return false;\n }\n\n address(_token).call(\n abi.encodeWithSignature(\"transferFrom(address,address,uint256)\", _from, _to, _value)\n );\n\n // Fail if the new balance its not equal than previous balance sub _value\n return prevBalance - _value == _token.balanceOf(_from);\n }\n\n /**\n * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.\n *\n * Beware that changing an allowance with this method brings the risk that someone may use both the old\n * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this\n * race condition is to first reduce the spender\u0027s allowance to 0 and set the desired value afterwards:\n * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n *\n * @param _token erc20 The address of the ERC20 contract\n * @param _spender The address which will spend the funds.\n * @param _value The amount of tokens to be spent.\n * @return bool whether the approve was successful or not\n */\n function safeApprove(IERC20 _token, address _spender, uint256 _value) internal returns (bool) {\n address(_token).call(\n abi.encodeWithSignature(\"approve(address,uint256)\",_spender, _value)\n );\n\n // Fail if the new allowance its not equal than _value\n return _token.allowance(address(this), _spender) == _value;\n }\n\n /**\n * @dev Clear approval\n * Note that if 0 is not a valid value it will be set to 1.\n * @param _token erc20 The address of the ERC20 contract\n * @param _spender The address which will spend the funds.\n */\n function clearApprove(IERC20 _token, address _spender) internal returns (bool) {\n bool success = safeApprove(_token, _spender, 0);\n\n if (!success) {\n success = safeApprove(_token, _spender, 1);\n }\n\n return success;\n }\n}"}}
< {"IERC20.sol":{"content":"pragma solidity ^0.4.23;\n\ncontract IERC20 {\n  function totalSupply() public constant returns (uint);\n  function balanceOf(address tokenOwner) public constant returns (uint balance);\n  function allowance(address tokenOwner, address spender) public constant returns (uint remaining);\n  function transfer(address to, uint tokens) public returns (bool success);\n  function approve(address spender, uint tokens) public returns (bool success);\n  function transferFrom(address from, address to, uint tokens) public returns (bool success);\n\n  event Transfer(address indexed from, address indexed to, uint tokens);\n  event Approval(address indexed tokenOwner, address indexed spender, uint tokens);\n}"},"Invoice.sol":{"content":"pragma solidity ^0.4.23;\n\nimport \"./IERC20.sol\";\nimport \"./SafeERC20.sol\";\n\ncontract Invoice {\n  using SafeERC20 for IERC20;\n\n  address public owner;\n  address public quoteSigner;\n  mapping(bytes32 =\u003e bool) public isPaid;\n\n  event PaymentAccepted(bytes32 indexed hash, address indexed tokenContract,  uint time, uint value);\n\n\n  constructor(address valueSigner) public {\n    owner = msg.sender;\n    quoteSigner = valueSigner;\n  }\n\n  function isValidPayment(\n    uint value,\n    uint gasPrice,\n    uint expiration,\n    bytes32 payload,\n    bytes32 hash,\n    uint8 v,\n    bytes32 r,\n    bytes32 s,\n    address tokenContract\n  ) public view returns(bool valid) {\n    bool isValid = !isPaid[payload];\n    isValid = isValid \u0026\u0026 block.timestamp \u003c= expiration;\n    bytes memory prefix = \"\\x19Ethereum Signed Message:\\n32\";\n    bytes32 ourHash = keccak256(abi.encodePacked(value, gasPrice, expiration, payload, tokenContract));\n    bytes32 payloadHash = keccak256(abi.encodePacked(prefix, ourHash));\n    isValid = isValid \u0026\u0026 ourHash == hash;\n    isValid = isValid \u0026\u0026 (ecrecover(payloadHash, v, r, s) == quoteSigner);\n    return isValid;\n  }\n\n  function validatePayment(\n    uint value,\n    uint gasPrice,\n    uint expiration,\n    bytes32 payload,\n    bytes32 hash,\n    uint8 v,\n    bytes32 r,\n    bytes32 s,\n    address tokenContract\n  ) public view returns(bool valid) {\n    require(isPaid[payload] == false, \"Already been paid\");\n    require(block.timestamp \u003c= expiration, \"Payment is late\");\n    bytes memory prefix = \"\\x19Ethereum Signed Message:\\n32\";\n    bytes32 ourHash = keccak256(abi.encodePacked(value, gasPrice, expiration, payload, tokenContract));\n    bytes32 payloadHash = keccak256(abi.encodePacked(prefix, ourHash));\n    require(ourHash == hash, \"Hash mismatch\");\n    require(ecrecover(payloadHash, v, r, s) == quoteSigner, \"Signature mismatch for quote\");\n    return true;\n  }\n\n\n  function pay(\n    uint value,\n    uint gasPrice,\n    uint expiration,\n    bytes32 payload,\n    bytes32 hash,\n    uint8 v,\n    bytes32 r,\n    bytes32 s,\n    address tokenContract\n  ) public payable {\n    if(tokenContract == 0x0) {\n      require(validatePayment(msg.value, gasPrice, expiration, payload, hash, v, r, s, tokenContract), \"Only accept valid payments\");\n    } else {\n      IERC20 token = IERC20(tokenContract);\n      require(token.allowance(msg.sender, address(this)) \u003e= value, \"Must have enough tokens to pay\");\n      require(validatePayment(value, gasPrice, expiration, payload, hash, v, r, s, tokenContract), \"Only accept valid payments\");\n      require(token.safeTransferFrom(msg.sender, address(this), value), \"Transfer must succeed\");\n    }\n    isPaid[payload] = true;\n    emit PaymentAccepted(hash, tokenContract, block.timestamp, value);\n  }\n\n  modifier isAdmin() {\n    require(msg.sender == owner, \"Must be the contract owner\");\n    _;\n  }\n\n  function withdraw(address tokenContract) public isAdmin {\n    if(tokenContract == 0x0) {\n      owner.transfer(address(this).balance);\n    } else {\n      IERC20 token = IERC20(tokenContract);\n      uint balance = token.balanceOf(address(this));\n      require(token.safeTransfer(owner, balance), \"Must succeed withdrawing tokens\");\n    }\n  }\n\n  function setSigner(address newQuoteSigner) public isAdmin {\n    quoteSigner = newQuoteSigner;\n  }\n  function setAdmin(address newAdmin) public isAdmin {\n    owner = newAdmin;\n  }\n}\n"},"SafeERC20.sol":{"content":"pragma solidity ^0.4.23;\n\nimport \"./IERC20.sol\";\n/**\n* @dev Library to perform safe calls to standard method for ERC20 tokens.\n*\n* Why Transfers: transfer methods could have a return value (bool), throw or revert for insufficient funds or\n* unathorized value.\n*\n* Why Approve: approve method could has a return value (bool) or does not accept 0 as a valid value (BNB token).\n* The common strategy used to clean approvals.\n*\n* We use the Solidity call instead of interface methods because in the case of transfer, it will fail\n* for tokens with an implementation without returning a value.\n* Since versions of Solidity 0.4.22 the EVM has a new opcode, called RETURNDATASIZE.\n* This opcode stores the size of the returned data of an external call. The code checks the size of the return value\n* after an external call and reverts the transaction in case the return data is shorter than expected\n*/\nlibrary SafeERC20 {\n    /**\n    * @dev Transfer token for a specified address\n    * @param _token erc20 The address of the ERC20 contract\n    * @param _to address The address which you want to transfer to\n    * @param _value uint256 the _value of tokens to be transferred\n    * @return bool whether the transfer was successful or not\n    */\n    function safeTransfer(IERC20 _token, address _to, uint256 _value) internal returns (bool) {\n        uint256 prevBalance = _token.balanceOf(address(this));\n\n        if (prevBalance \u003c _value) {\n            // Insufficient funds\n            return false;\n        }\n\n        address(_token).call(\n            abi.encodeWithSignature(\"transfer(address,uint256)\", _to, _value)\n        );\n\n        // Fail if the new balance its not equal than previous balance sub _value\n        return prevBalance - _value == _token.balanceOf(address(this));\n    }\n\n    /**\n    * @dev Transfer tokens from one address to another\n    * @param _token erc20 The address of the ERC20 contract\n    * @param _from address The address which you want to send tokens from\n    * @param _to address The address which you want to transfer to\n    * @param _value uint256 the _value of tokens to be transferred\n    * @return bool whether the transfer was successful or not\n    */\n    function safeTransferFrom(\n        IERC20 _token,\n        address _from,\n        address _to,\n        uint256 _value\n    ) internal returns (bool)\n    {\n        uint256 prevBalance = _token.balanceOf(_from);\n\n        if (\n          prevBalance \u003c _value || // Insufficient funds\n          _token.allowance(_from, address(this)) \u003c _value // Insufficient allowance\n        ) {\n            return false;\n        }\n\n        address(_token).call(\n            abi.encodeWithSignature(\"transferFrom(address,address,uint256)\", _from, _to, _value)\n        );\n\n        // Fail if the new balance its not equal than previous balance sub _value\n        return prevBalance - _value == _token.balanceOf(_from);\n    }\n\n   /**\n   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.\n   *\n   * Beware that changing an allowance with this method brings the risk that someone may use both the old\n   * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this\n   * race condition is to first reduce the spender\u0027s allowance to 0 and set the desired value afterwards:\n   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n   *\n   * @param _token erc20 The address of the ERC20 contract\n   * @param _spender The address which will spend the funds.\n   * @param _value The amount of tokens to be spent.\n   * @return bool whether the approve was successful or not\n   */\n    function safeApprove(IERC20 _token, address _spender, uint256 _value) internal returns (bool) {\n        address(_token).call(\n            abi.encodeWithSignature(\"approve(address,uint256)\",_spender, _value)\n        );\n\n        // Fail if the new allowance its not equal than _value\n        return _token.allowance(address(this), _spender) == _value;\n    }\n\n   /**\n   * @dev Clear approval\n   * Note that if 0 is not a valid value it will be set to 1.\n   * @param _token erc20 The address of the ERC20 contract\n   * @param _spender The address which will spend the funds.\n   */\n    function clearApprove(IERC20 _token, address _spender) internal returns (bool) {\n        bool success = safeApprove(_token, _spender, 0);\n\n        if (!success) {\n            success = safeApprove(_token, _spender, 1);\n        }\n\n        return success;\n    }\n}"}} <

Invoice ABI

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[{"constant":true,"inputs":[{"name":"value","type":"uint256"},{"name":"gasPrice","type":"uint256"},{"name":"expiration","type":"uint256"},{"name":"payload","type":"bytes32"},{"name":"hash","type":"bytes32"},{"name":"v","type":"uint8"},{"name":"r","type":"bytes32"},{"name":"s","type":"bytes32"},{"name":"tokenContract","type":"address"}],"name":"validatePayment","outputs":[{"name":"valid","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"tokenContract","type":"address"}],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newQuoteSigner","type":"address"}],"name":"setSigner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newAdmin","type":"address"}],"name":"setAdmin","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"value","type":"uint256"},{"name":"gasPrice","type":"uint256"},{"name":"expiration","type":"uint256"},{"name":"payload","type":"bytes32"},{"name":"hash","type":"bytes32"},{"name":"v","type":"uint8"},{"name":"r","type":"bytes32"},{"name":"s","type":"bytes32"},{"name":"tokenContract","type":"address"}],"name":"isValidPayment","outputs":[{"name":"valid","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"value","type":"uint256"},{"name":"gasPrice","type":"uint256"},{"name":"expiration","type":"uint256"},{"name":"payload","type":"bytes32"},{"name":"hash","type":"bytes32"},{"name":"v","type":"uint8"},{"name":"r","type":"bytes32"},{"name":"s","type":"bytes32"},{"name":"tokenContract","type":"address"}],"name":"pay","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[],"name":"quoteSigner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"isPaid","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[{"name":"valueSigner","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"hash","type":"bytes32"},{"indexed":true,"name":"tokenContract","type":"address"},{"indexed":false,"name":"time","type":"uint256"},{"indexed":false,"name":"value","type":"uint256"}],"name":"PaymentAccepted","type":"event"}]
[{"constant":true,"inputs":[{"name":"value","type":"uint256"},{"name":"gasPrice","type":"uint256"},{"name":"expiration","type":"uint256"},{"name":"payload","type":"bytes32"},{"name":"hash","type":"bytes32"},{"name":"v","type":"uint8"},{"name":"r","type":"bytes32"},{"name":"s","type":"bytes32"},{"name":"tokenContract","type":"address"}],"name":"validatePayment","outputs":[{"name":"valid","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"tokenContract","type":"address"}],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newQuoteSigner","type":"address"}],"name":"setSigner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newAdmin","type":"address"}],"name":"setAdmin","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"value","type":"uint256"},{"name":"gasPrice","type":"uint256"},{"name":"expiration","type":"uint256"},{"name":"payload","type":"bytes32"},{"name":"hash","type":"bytes32"},{"name":"v","type":"uint8"},{"name":"r","type":"bytes32"},{"name":"s","type":"bytes32"},{"name":"tokenContract","type":"address"}],"name":"isValidPayment","outputs":[{"name":"valid","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"value","type":"uint256"},{"name":"gasPrice","type":"uint256"},{"name":"expiration","type":"uint256"},{"name":"payload","type":"bytes32"},{"name":"hash","type":"bytes32"},{"name":"v","type":"uint8"},{"name":"r","type":"bytes32"},{"name":"s","type":"bytes32"},{"name":"tokenContract","type":"address"}],"name":"pay","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[],"name":"quoteSigner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"isPaid","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[{"name":"valueSigner","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"hash","type":"bytes32"},{"indexed":true,"name":"tokenContract","type":"address"},{"indexed":false,"name":"time","type":"uint256"},{"indexed":false,"name":"value","type":"uint256"}],"name":"PaymentAccepted","type":"event"}]

Invoice Bytecode

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