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Is it possible(or OK) to provide in-app purchase in a free android app? I want to create one app that will be free for a limited time. User will be prompted to pay for it after few months. My app has lot of user generated data. Migrating the data to a paid version is quite complicated.
I think you can hang on to the free app and use a key in the paid version, which unlocks the free app for continuous use. This technique is used in the app Cardio Trainer, but in their case they unlock other features of the free app.