[android-developers] Paid App to in-App purchase: Keeping old users

I'm about to attempt to convert one of my apps from a paid app into a free app with in-app purchases.

My problem is that I want to grandfather in the older users to paid for it in the first place in good faith.

Has anybody else tried to do this and what solution did you hit upon that might work?

So far I have three ideas:

1) Simply record the account that the app was purchased form in a custom DB.

2) Ask the user if they want to be recorded as a legacy user and then record them in the custom DB.

3) Try and use licensing to check if a users has already paid for the app (won't work on non-google play stores).

I don't know if 3 will work at all, but it might register as licensed for those that paid for it originally or it might reset when I make it free or it might not (still) work for free apps.

Anyway, I'd like some feedback if anyone wants to give any ;)

- Brill

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