Transition an existing paid for app to free version with In App Purchase

Question

I have existing users of a paid for app on the App Store. I\'d like to transition the app to a free app with unlock-able features. Is there a way to roll my existing users i

Answer 1

For me, maintain two separate code bases won't be a good solution, because you will need to maintain 2 in app purchase (worse with in app purchase with a server), maybe 2 game center, and separate your download (and so less visible) because maybe some new user will directly buy the pay app.

But to change pay app to free app, I have no good way to do it, for the main reason if you upgrade your device, and so clean it, you won't have something to don't get free app to the first users to pay for it, and to have really angry users.

The best way will be to be able to ask an apple database to know when the user buy the application or something like that. If someone know a tricks to do that, I will love he shares it ;)