Contract 0x1bd0a503ef149b188bfa31205028db0401186107

// SPDX-License-Identifier: MIT
pragma solidity >0.7.5;

import "@eth-optimism/contracts/contracts/libraries/constants/Lib_PredeployAddresses.sol";

import "@eth-optimism/contracts/contracts/L2/messaging/IL2ERC20Bridge.sol";
import "@eth-optimism/contracts/contracts/L2/predeploys/OVM_GasPriceOracle.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

import "./L2BillingContract.sol";

contract DiscretionaryExitFee is Ownable {
    using SafeERC20 for IERC20;
    using SafeMath for uint256;

    address public l2Bridge;
    address public billingContractAddress;

    constructor(address _l2Bridge) {
        l2Bridge = _l2Bridge;
    }

    modifier onlyWithBillingContract() {
        require(billingContractAddress != address(0), "Billing contract address is not set");
        _;
    }

    function configureBillingContractAddress(
        address _billingContractAddress
    )
        public
        onlyOwner()
    {
        require(_billingContractAddress != address(0), "Billing contract address cannot be zero");
        billingContractAddress = _billingContractAddress;
    }

    function payAndWithdraw(
        address _l2Token,
        uint256 _amount,
        uint32 _l1Gas,
        bytes calldata _data
    ) external payable onlyWithBillingContract {
        // Collect the exit fee
        L2BillingContract billingContract = L2BillingContract(billingContractAddress);
        IERC20(billingContract.feeTokenAddress()).safeTransferFrom(msg.sender, billingContractAddress, billingContract.exitFee());

        require(!(msg.value != 0 && _l2Token != Lib_PredeployAddresses.OVM_ETH), "Amount Incorrect");

        if (msg.value != 0) {
            // override the _amount and token address
            _amount = msg.value;
            _l2Token = Lib_PredeployAddresses.OVM_ETH;
        }

        // transfer funds if users deposit ERC20
        if (_l2Token != Lib_PredeployAddresses.OVM_ETH) {
            IERC20(_l2Token).safeTransferFrom(msg.sender, address(this), _amount);
        }

        // call withdrawTo on the l2Bridge
        IL2ERC20Bridge(l2Bridge).withdrawTo(_l2Token, msg.sender, _amount, _l1Gas, _data);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

/**
 * @title Lib_PredeployAddresses
 */
library Lib_PredeployAddresses {
    // solhint-disable max-line-length
    address internal constant L2_TO_L1_MESSAGE_PASSER = 0x4200000000000000000000000000000000000000;
    address internal constant L1_MESSAGE_SENDER = 0x4200000000000000000000000000000000000001;
    address internal constant DEPLOYER_WHITELIST = 0x4200000000000000000000000000000000000002;
    address payable internal constant OVM_ETH = payable(0x4200000000000000000000000000000000000006);
    // solhint-disable-next-line max-line-length
    address internal constant L2_CROSS_DOMAIN_MESSENGER =
        0x4200000000000000000000000000000000000007;
    address internal constant LIB_ADDRESS_MANAGER = 0x4200000000000000000000000000000000000008;
    address internal constant PROXY_EOA = 0x4200000000000000000000000000000000000009;
    address internal constant L2_STANDARD_BRIDGE = 0x4200000000000000000000000000000000000010;
    address internal constant SEQUENCER_FEE_WALLET = 0x4200000000000000000000000000000000000011;
    address internal constant L2_STANDARD_TOKEN_FACTORY =
        0x4200000000000000000000000000000000000012;
    address internal constant L1_BLOCK_NUMBER = 0x4200000000000000000000000000000000000013;
    address internal constant OVM_GAS_PRICE_ORACLE = 0x420000000000000000000000000000000000000F;
    address internal constant PROXY__BOBA_TURING_PREPAY =
        0x4200000000000000000000000000000000000020;
    address internal constant BOBA_TURING_PREPAY = 0x4200000000000000000000000000000000000021;
    address internal constant BOBA_TURING_HELPER = 0x4200000000000000000000000000000000000022;
    address internal constant L2_BOBA = 0x4200000000000000000000000000000000000023;
    address internal constant PROXY__BOBA_GAS_PRICE_ORACLE =
        0x4200000000000000000000000000000000000024;
    address internal constant BOBA_GAS_PRICE_ORACLE = 0x4200000000000000000000000000000000000025;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

/**
 * @title IL2ERC20Bridge
 */
interface IL2ERC20Bridge {
    /**********
     * Events *
     **********/

    event WithdrawalInitiated(
        address indexed _l1Token,
        address indexed _l2Token,
        address indexed _from,
        address _to,
        uint256 _amount,
        bytes _data
    );

    event DepositFinalized(
        address indexed _l1Token,
        address indexed _l2Token,
        address indexed _from,
        address _to,
        uint256 _amount,
        bytes _data
    );

    event DepositFailed(
        address indexed _l1Token,
        address indexed _l2Token,
        address indexed _from,
        address _to,
        uint256 _amount,
        bytes _data
    );

    /********************
     * Public Functions *
     ********************/

    /**
     * @dev get the address of the corresponding L1 bridge contract.
     * @return Address of the corresponding L1 bridge contract.
     */
    function l1TokenBridge() external returns (address);

    /**
     * @dev initiate a withdraw of some tokens to the caller's account on L1
     * @param _l2Token Address of L2 token where withdrawal was initiated.
     * @param _amount Amount of the token to withdraw.
     * param _l1Gas Unused, but included for potential forward compatibility considerations.
     * @param _data Optional data to forward to L1. This data is provided
     *        solely as a convenience for external contracts. Aside from enforcing a maximum
     *        length, these contracts provide no guarantees about its content.
     */
    function withdraw(
        address _l2Token,
        uint256 _amount,
        uint32 _l1Gas,
        bytes calldata _data
    ) external;

    /**
     * @dev initiate a withdraw of some token to a recipient's account on L1.
     * @param _l2Token Address of L2 token where withdrawal is initiated.
     * @param _to L1 adress to credit the withdrawal to.
     * @param _amount Amount of the token to withdraw.
     * param _l1Gas Unused, but included for potential forward compatibility considerations.
     * @param _data Optional data to forward to L1. This data is provided
     *        solely as a convenience for external contracts. Aside from enforcing a maximum
     *        length, these contracts provide no guarantees about its content.
     */
    function withdrawTo(
        address _l2Token,
        address _to,
        uint256 _amount,
        uint32 _l1Gas,
        bytes calldata _data
    ) external;

    /*************************
     * Cross-chain Functions *
     *************************/

    /**
     * @dev Complete a deposit from L1 to L2, and credits funds to the recipient's balance of this
     * L2 token. This call will fail if it did not originate from a corresponding deposit in
     * L1StandardTokenBridge.
     * @param _l1Token Address for the l1 token this is called with
     * @param _l2Token Address for the l2 token this is called with
     * @param _from Account to pull the deposit from on L2.
     * @param _to Address to receive the withdrawal at
     * @param _amount Amount of the token to withdraw
     * @param _data Data provider by the sender on L1. This data is provided
     *        solely as a convenience for external contracts. Aside from enforcing a maximum
     *        length, these contracts provide no guarantees about its content.
     */
    function finalizeDeposit(
        address _l1Token,
        address _l2Token,
        address _from,
        address _to,
        uint256 _amount,
        bytes calldata _data
    ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

/* External Imports */
import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";

/**
 * @title OVM_GasPriceOracle
 * @dev This contract exposes the current l2 gas price, a measure of how congested the network
 * currently is. This measure is used by the Sequencer to determine what fee to charge for
 * transactions. When the system is more congested, the l2 gas price will increase and fees
 * will also increase as a result.
 *
 * All public variables are set while generating the initial L2 state. The
 * constructor doesn't run in practice as the L2 state generation script uses
 * the deployed bytecode instead of running the initcode.
 */
contract OVM_GasPriceOracle is Ownable {
    /*************
     * Variables *
     *************/

    // Current L2 gas price
    uint256 public gasPrice;
    // Current L1 base fee
    uint256 public l1BaseFee;
    // Amortized cost of batch submission per transaction
    uint256 public overhead;
    // Value to scale the fee up by
    uint256 public scalar;
    // Number of decimals of the scalar
    uint256 public decimals;

    /***************
     * Constructor *
     ***************/

    /**
     * @param _owner Address that will initially own this contract.
     */
    constructor(address _owner) Ownable() {
        transferOwnership(_owner);
    }

    /**********
     * Events *
     **********/

    event GasPriceUpdated(uint256);
    event L1BaseFeeUpdated(uint256);
    event OverheadUpdated(uint256);
    event ScalarUpdated(uint256);
    event DecimalsUpdated(uint256);

    /********************
     * Public Functions *
     ********************/

    /**
     * Allows the owner to modify the l2 gas price.
     * @param _gasPrice New l2 gas price.
     */
    function setGasPrice(uint256 _gasPrice) public onlyOwner {
        gasPrice = _gasPrice;
        emit GasPriceUpdated(_gasPrice);
    }

    /**
     * Allows the owner to modify the l1 base fee.
     * @param _baseFee New l1 base fee
     */
    function setL1BaseFee(uint256 _baseFee) public onlyOwner {
        l1BaseFee = _baseFee;
        emit L1BaseFeeUpdated(_baseFee);
    }

    /**
     * Allows the owner to modify the overhead.
     * @param _overhead New overhead
     */
    function setOverhead(uint256 _overhead) public onlyOwner {
        overhead = _overhead;
        emit OverheadUpdated(_overhead);
    }

    /**
     * Allows the owner to modify the scalar.
     * @param _scalar New scalar
     */
    function setScalar(uint256 _scalar) public onlyOwner {
        scalar = _scalar;
        emit ScalarUpdated(_scalar);
    }

    /**
     * Allows the owner to modify the decimals.
     * @param _decimals New decimals
     */
    function setDecimals(uint256 _decimals) public onlyOwner {
        decimals = _decimals;
        emit DecimalsUpdated(_decimals);
    }

    /**
     * Computes the L1 portion of the fee
     * based on the size of the RLP encoded tx
     * and the current l1BaseFee
     * @param _data Unsigned RLP encoded tx, 6 elements
     * @return L1 fee that should be paid for the tx
     */
    function getL1Fee(bytes memory _data) public view returns (uint256) {
        uint256 l1GasUsed = getL1GasUsed(_data);
        uint256 l1Fee = l1GasUsed * l1BaseFee;
        uint256 divisor = 10**decimals;
        uint256 unscaled = l1Fee * scalar;
        uint256 scaled = unscaled / divisor;
        return scaled;
    }

    /**
     * Computes the extra L2 gas to cover the
     * L1 security fee
     * @param _data Unsigned RLP encoded tx, 6 elements
     * @return L2 extra gas that should be included in the L2 gas
     */
    function getExtraL2Gas(bytes memory _data) public view returns (uint256) {
        return getL1Fee(_data) / gasPrice;
    }

    /**
     * Computes the amount of L1 gas used for a transaction
     * The overhead represents the per batch gas overhead of
     * posting both transaction and state roots to L1 given larger
     * batch sizes.
     * 4 gas for 0 byte
     * https://github.com/ethereum/go-ethereum/blob/
     *    9ada4a2e2c415e6b0b51c50e901336872e028872/params/protocol_params.go#L33
     * 16 gas for non zero byte
     * https://github.com/ethereum/go-ethereum/blob/
     *    9ada4a2e2c415e6b0b51c50e901336872e028872/params/protocol_params.go#L87
     * This will need to be updated if calldata gas prices change
     * Account for the transaction being unsigned
     * Padding is added to account for lack of signature on transaction
     * 1 byte for RLP V prefix
     * 1 byte for V
     * 1 byte for RLP R prefix
     * 32 bytes for R
     * 1 byte for RLP S prefix
     * 32 bytes for S
     * Total: 68 bytes of padding
     * @param _data Unsigned RLP encoded tx, 6 elements
     * @return Amount of L1 gas used for a transaction
     */
    function getL1GasUsed(bytes memory _data) public view returns (uint256) {
        uint256 total = 0;
        for (uint256 i = 0; i < _data.length; i++) {
            if (_data[i] == 0) {
                total += 4;
            } else {
                total += 16;
            }
        }
        uint256 unsigned = total + overhead;
        return unsigned + (68 * 16);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    function safeTransfer(
        IERC20 token,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(
        IERC20 token,
        address from,
        address to,
        uint256 value
    ) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        uint256 newAllowance = token.allowance(address(this), spender) + value;
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(
        IERC20 token,
        address spender,
        uint256 value
    ) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            uint256 newAllowance = oldAllowance - value;
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        if (returndata.length > 0) {
            // Return data is optional
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _setOwner(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity >0.7.5;

import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
import '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';

contract L2BillingContract {
    using SafeERC20 for IERC20;

    /*************
     * Variables *
     *************/

    address public owner;
    address public feeTokenAddress;
    address public l2FeeWallet;
    uint256 public exitFee;

    /*************
     *   Events  *
     *************/

    event TransferOwnership(address, address);
    event UpdateExitFee(uint256);
    event CollectFee(address, uint256);
    event Withdraw(address, uint256);

    /*************
     * Modifiers *
     *************/

    modifier onlyNotInitialized() {
        require(feeTokenAddress == address(0), "Contract has been initialized");
        _;
    }

    modifier onlyInitialized() {
        require(feeTokenAddress != address(0), "Contract has not been initialized");
        _;
    }

    modifier onlyOwner() {
        require(owner == msg.sender, "Caller is not the owner");
        _;
    }

    /*************
     * Functions *
     *************/

    function initialize(address _feeTokenAddress, address _l2FeeWallet, uint256 _exitFee) public onlyNotInitialized {
        require(_feeTokenAddress != address(0), "Fee token address cannot be zero");
        require(_l2FeeWallet != address(0), "L2 fee wallet cannot be zero");
        require(_exitFee > 0, "exit fee cannot be zero");
        feeTokenAddress = _feeTokenAddress;
        l2FeeWallet = _l2FeeWallet;
        exitFee = _exitFee;
        owner = msg.sender;
    }

    function transferOwnership(address _newOwner) public onlyOwner {
        require(_newOwner != address(0), "Ownable: new owner is the zero address");
        address oldOwner = owner;
        owner = _newOwner;
        emit TransferOwnership(oldOwner, _newOwner);
    }

      function updateExitFee(uint256 _exitFee)
        public
        onlyOwner()
    {
        require(_exitFee > 0, "exit fee cannot be zero");
        exitFee = _exitFee;

        emit UpdateExitFee(_exitFee);
    }

    function collectFee() external onlyInitialized {
        IERC20(feeTokenAddress).safeTransferFrom(msg.sender, address(this), exitFee);

        emit CollectFee(msg.sender, exitFee);
    }

    function withdraw() external onlyInitialized {
        uint256 balance = IERC20(feeTokenAddress).balanceOf(address(this));
        require(balance >= 150e18, "Balance is too low");
        IERC20(feeTokenAddress).safeTransfer(l2FeeWallet, balance);

        emit Withdraw(l2FeeWallet, balance);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 10000
  },
  "metadata": {
    "bytecodeHash": "none",
    "useLiteralContent": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_l2Bridge","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[],"name":"billingContractAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_billingContractAddress","type":"address"}],"name":"configureBillingContractAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"l2Bridge","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_l2Token","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"uint32","name":"_l1Gas","type":"uint32"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"payAndWithdraw","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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0000000000000000000000004200000000000000000000000000000000000010

-----Decoded View---------------
Arg [0] : _l2Bridge (address): 0x4200000000000000000000000000000000000010

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000004200000000000000000000000000000000000010