hyperlane-monorepo/solidity/contracts/interfaces/optimism/IOptimismPortal.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// author: OP Labs
// copied from https://github.com/ethereum-optimism/optimism/tree/develop/packages/contracts-bedrock
interface IOptimismPortal {
    /// @notice Struct representing a withdrawal transaction.
    /// @custom:field nonce    Nonce of the withdrawal transaction
    /// @custom:field sender   Address of the sender of the transaction.
    /// @custom:field target   Address of the recipient of the transaction.
    /// @custom:field value    Value to send to the recipient.
    /// @custom:field gasLimit Gas limit of the transaction.
    /// @custom:field data     Data of the transaction.
    struct WithdrawalTransaction {
        uint256 nonce;
        address sender;
        address target;
        uint256 value;
        uint256 gasLimit;
        bytes data;
    }

    /// @notice Finalizes a withdrawal transaction.
    /// @param _tx Withdrawal transaction to finalize.
    function finalizeWithdrawalTransaction(
        WithdrawalTransaction memory _tx
    ) external;
}