ReadonlyactionOptional ReadonlyinterfaceIdentifier used by the payment service that processes the Payment (for example, a PSP) in the current transaction. It must be unique across all transactions.
If interfaceId is absent, this field will be removed from the specified Transaction, if it exists.
ReadonlytransactionUnique identifier of the Transaction.
Setting the transaction interface ID produces the PaymentTransactionInterfaceIdSet Message.