def METHOD_NAME(self, method):
    """Map shipping method with API method. Note that currently only land
    is supported. Default to land to ensure a method is provided.
    :params string with shipping method
    :returns string with the mapped key value for the proper method
    """
    method_map = {
        "land": "getBookingRequestLand",
        "air": "getBookingRequestAir",
        "ocean_fcl": "getBookingRequestOceanFCL",
        "ocean_lcl": "getBookingRequestOceanLCL",
    }
    return method_map.get("method", "getBookingRequestLand")