{
  "fileName": "PullPayment.sol",
  "contractName": "PullPayment",
  "source": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\nimport \"./escrow/Escrow.sol\";\n\n/**\n * @dev Simple implementation of a\n * https://consensys.github.io/smart-contract-best-practices/recommendations/#favor-pull-over-push-for-external-calls[pull-payment]\n * strategy, where the paying contract doesn't interact directly with the\n * receiver account, which must withdraw its payments itself.\n *\n * Pull-payments are often considered the best practice when it comes to sending\n * Ether, security-wise. It prevents recipients from blocking execution, and\n * eliminates reentrancy concerns.\n *\n * TIP: If you would like to learn more about reentrancy and alternative ways\n * to protect against it, check out our blog post\n * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].\n *\n * To use, derive from the `PullPayment` contract, and use {_asyncTransfer}\n * instead of Solidity's `transfer` function. Payees can query their due\n * payments with {payments}, and retrieve them with {withdrawPayments}.\n */\ncontract PullPayment {\n    Escrow private _escrow;\n\n    constructor () {\n        _escrow = new Escrow();\n    }\n\n    /**\n     * @dev Withdraw accumulated payments, forwarding all gas to the recipient.\n     *\n     * Note that _any_ account can call this function, not just the `payee`.\n     * This means that contracts unaware of the `PullPayment` protocol can still\n     * receive funds this way, by having a separate account call\n     * {withdrawPayments}.\n     *\n     * WARNING: Forwarding all gas opens the door to reentrancy vulnerabilities.\n     * Make sure you trust the recipient, or are either following the\n     * checks-effects-interactions pattern or using {ReentrancyGuard}.\n     *\n     * @param payee Whose payments will be withdrawn.\n     */\n    function withdrawPayments(address payable payee) public virtual {\n        _escrow.withdraw(payee);\n    }\n\n    /**\n     * @dev Returns the payments owed to an address.\n     * @param dest The creditor's address.\n     */\n    function payments(address dest) public view returns (uint256) {\n        return _escrow.depositsOf(dest);\n    }\n\n    /**\n     * @dev Called by the payer to store the sent amount as credit to be pulled.\n     * Funds sent in this way are stored in an intermediate {Escrow} contract, so\n     * there is no danger of them being spent before withdrawal.\n     *\n     * @param dest The destination address of the funds.\n     * @param amount The amount to transfer.\n     */\n    function _asyncTransfer(address dest, uint256 amount) internal virtual {\n        _escrow.deposit{ value: amount }(dest);\n    }\n}\n",
  "sourcePath": "contracts/payment/PullPayment.sol",
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  "abi": [
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      "inputs": [],
      "stateMutability": "nonpayable",
      "type": "constructor"
    },
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        {
          "internalType": "address",
          "name": "dest",
          "type": "address"
        }
      ],
      "name": "payments",
      "outputs": [
        {
          "internalType": "uint256",
          "name": "",
          "type": "uint256"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    },
    {
      "inputs": [
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          "internalType": "address payable",
          "name": "payee",
          "type": "address"
        }
      ],
      "name": "withdrawPayments",
      "outputs": [],
      "stateMutability": "nonpayable",
      "type": "function"
    }
  ],
  "ast": {
    "absolutePath": "contracts/payment/PullPayment.sol",
    "exportedSymbols": {
      "PullPayment": [
        6513
      ]
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    "license": "MIT",
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        "absolutePath": "contracts/payment/escrow/Escrow.sol",
        "file": "./escrow/Escrow.sol",
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          "src": "89:949:69",
          "text": " @dev Simple implementation of a\n https://consensys.github.io/smart-contract-best-practices/recommendations/#favor-pull-over-push-for-external-calls[pull-payment]\n strategy, where the paying contract doesn't interact directly with the\n receiver account, which must withdraw its payments itself.\n Pull-payments are often considered the best practice when it comes to sending\n Ether, security-wise. It prevents recipients from blocking execution, and\n eliminates reentrancy concerns.\n TIP: If you would like to learn more about reentrancy and alternative ways\n to protect against it, check out our blog post\n https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].\n To use, derive from the `PullPayment` contract, and use {_asyncTransfer}\n instead of Solidity's `transfer` function. Payees can query their due\n payments with {payments}, and retrieve them with {withdrawPayments}."
        },
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