function outboundTransfer(
    address _token,
    address _to,
    uint256 _amount,
    uint256 _maxGas,
    uint256 _gasPriceBid,
    bytes calldata _data
) external payable returns (bytes memory);
function outboundTransfer(
    address _l1Token,
    address _to,
    uint256 _amount,
    bytes calldata _data
) public payable returns (bytes memory) {
    return outboundTransfer(_l1Token, _to, _amount, 0, 0, _data);
}
function outboundTransfer(
    address _token,
    address _to,
    uint256 _amount,
    uint256 _maxGas,
    uint256 _gasPriceBid,
    bytes calldata _data
) public payable virtual override returns (bytes memory) {
    address gateway = getGateway(_token);
    bytes memory gatewayData = GatewayMessageHandler.encodeFromRouterToGateway(
        msg.sender,
        _data
    );

    emit TransferRouted(_token, msg.sender, _to, gateway);
    return
        ITokenGateway(gateway).outboundTransfer{ value: msg.value }(
            _token,
            _to,
            _amount,
            _maxGas,
            _gasPriceBid,
            gatewayData
        );
}
function outboundTransfer(
    address _l1Token,
    address _to,
    uint256 _amount,
    bytes calldata _data
) public override whenNotPaused returns (bytes memory res) {
    // ...
}
