In Xcode 11 I created standalone iMessage app File, New, Projects, iMessage App. Then I got two targets. AppName with product identifier: com.AppName, AppName MessagesExtension with product identifier: com.AppName.MessagesExtension and Enabled IAPs.
In App Store Connect I created new app My Apps, +, New App. Where I selected following bundle ID com.AppName.MessagesExtension and added IAP Features-In-App Purchases with product ID: Example.
Then I added in-app purchase Example to com.AppName.MessagesExtension, but when loading IAPs it says IAP not found.
I have tried to change product ID here of IAP with no help.
IAP code is fully working in another app (not standalone iMessage app)!
