Only the Transaction URL is used for gift card integrations, so it would be https://certtransaction.elementexpress.com that should be used. Also, to support StoreCard, new enhancements were made, but only to the XML interface, so I'd only suggest XML be used on Express going forward, as we are no longer updating our SOAP interface.
We have a partner integrating to the Express Gift API. Can you verify the URL's that should be used along with examples (similar to the credit specification) of the XML format request messages? Neither were seen in the API specification above.
My guess is that we use the following endpoints and that the message structure "GiftCardSale", "GiftCardBalanceInquiry" etc. tells the system what transaction type was sent?
https://certtransaction.elementexpress.com/express.asmx
https://certreporting.elementexpress.com/express.asmx
https://certservices.elementexpress.com/express.asmx