IERC3156FlashBorrower.sol

// SPDX-License-Identifier: MIT

pragma solidity 0.8.14;

interface IERC3156FlashBorrower {

    /**
     * @dev    Receive a flash loan.
     * @param  initiator The initiator of the loan.
     * @param  token     The loan currency.
     * @param  amount    The amount of tokens lent.
     * @param  fee       The additional amount of tokens to repay.
     * @param  data      Arbitrary data structure, intended to contain user-defined parameters.
     * @return The `keccak256` hash of `ERC3156FlashBorrower.onFlashLoan`
     */
    function onFlashLoan(
        address initiator,
        address token,
        uint256 amount,
        uint256 fee,
        bytes   calldata data
    ) external returns (bytes32);
}