In our app we have 2 app naming schemas: com.my.app for release builds, and com.my.app.debug, for, well, debugging.
This is setup this way, so we can separate analytics on Firebase - so debug crashes don't pollute our productions insights.
In comes Android Billing. In our Play store account, we have uploaded our productions build .aab (com.my.app), and set-up some in-app subscriptions. I'll add that we are still in the pre-prod stage.
Problem is- we don't get any SKUs in debug build, since the package signature is different than the one configured in, and up-loaded to Play Store console.
The questions is- Is there a way to integrate/test our production Android Billing products against our debug build, other than creating a new app with the debug package name?
No, different package means different app and therefore different in-app products that cannot be shared with another app.
The strange thing is that you have made a different app for debugging when android studio and other IDEs can work in debug mode or release mode without changing project.