I'm working on a NodeJS server to log transactions. Did you get it working, and could you share a request handler of how to decode the message?
RenarsL
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Hi, we are having the same problem. Did you find a solution?
You can pass appAccountToken in the purchase options (1). That should be included when the server receives the transaction (2).
https://developer.apple.com/documentation/storekit/product/3791971-purchase
https://developer.apple.com/documentation/appstoreservernotifications/appaccounttoken