A USPS-specific extra service
This maps to an input with a GraphQL @oneOf directive.
This means you have to specify exactly one of the keys:
registered_mail:
tracking_plus:
return_receipt:
A USPS-specific extra service
This maps to an input with a GraphQL @oneOf directive.
This means you have to specify exactly one of the keys:
registered_mail:UspsRegisteredMailtracking_plus:UspsTrackingPlusreturn_receipt:UspsReturnReceipt