I think you mean the App needs google play services to work.

The app it self can not check from which source it was installed.

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I have google play services. Apps can know if they were installed through google play.

I develop android apps for more than ten years and I don’t know a single way to verify if a app was installed over plan or a third story.

But maybe I’m missing a function 🤔

I'm not an android dev but the information seems to be there:

Okay, but that’s a information saved by the os. 🤔

Strange

Okay, interesting 🧐