Disconnect between Xcode IAP and App Store server

I'm trying to interact with the App Store server based on transactions within Xcode involving IAP.

I generate a transaction as follows:

Note, it has transaction ID "12". Under the uuid of the transaction as issuer, server interaction results in 401.

However, under my own issuer ID, the server complains it has no knowledge of the transaction that was completed, as follows:

How may I interact with transactions from Xcode in the sandbox for the App Store server?

I'm hoping I may validate transactions prior to "consuming" services, especially since they cost money from our end.

Thank you for your feedback. App Store Server APIs support retrieving the transaction information which is created in Sandbox. Please refer to the links below for more information: 

App Store Server API

Testing In-App Purchases with Sandbox

Disconnect between Xcode IAP and App Store server
 
 
Q