Method that is used to ship the order (e.g. UPS, DHL, etc.)
Used for passing the identifier used to identify the shipping costs at the payment provider. This is required for payments that need capture on line level like Klarna.
When known the exact TaxAmount can be specified. Used when tax calculations are done by an external party like Avatax.
Tax rate of the shipping method, when Amount / UnitPriceInTax is set and it's not provided, the taxrate will be based on what is known in Eva. When no rate can be determined, an error will be thrown.
ShippingCosts, before discounts, based on the SoldFromOrganizationUnit settings this should be in or ex tax. See service documentation.