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Using android.content.SharedPreferences, set one singaling the user purchased a license from the Amazon copy of the app, read it from the Google Play app.

It is doable, the main issues is: 1. Getting users to redownload the app from the Play store 2. Maintaining this registration transfer mechanism

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axus a day ago | parent [-]

I think issue #1 is a big one, how to download a paid app without paying for it? Not everything is freemium.

Shattered Pixel Dungeon was a good example of me paying on one platform, and then applying the upgrade to the free app after downloading on another.

	▲	dylan604 a day ago \| parent [-]
		That's on the dev of the app. They should absolutely have the ability to see that you download the app, and allow full access again. This isn't any different from a user switching to a new device and having to download apps again. Not everyone restores from backup and prefers clean installs. Downloading an app again should not be the point of friction