public decimal CalculateShippingFees(FedExShippingRequest request) => 0;
public Guid CreateNewShipment(FedExShippingRequest request) => Guid.Empty;
public decimal CalculateShippingFees(FedExShippingRequest request) => 0;
public Guid CreateNewShipment(FedExShippingRequest request) => Guid.Empty;