This type is used to express sales tax details for the shipping destination. Sales tax information is only returned in GetShippingCosts (through ShippingDetails.SalesTax container) if sales tax is applicable to the shipping destination.
State or jurisdiction for which the sales tax is applicable. Only returned if the seller specified a value. This should be the same value that is passed into the DestinationPostalCode in the call request.
See the Field Index to learn which calls use SalesTaxState.