Changing app's price to free, while implementing in-app items

Question

I work on a new version of my application already available on the Store. For the moment this is a paid app. I want to change my business model and set the app price to free with the possibility for new users to unlock some features by purchasing an in-app.

I already understand how to add the in-app. I don't know how to manage users that have already bought the app! What is the good way to detect / unlock an in-app for my previous users when they will update the app?

Thanks

François

Answer 1

Answer from Google support:

"there isn't currently an easy way to allow users that have previously purchased the app to buy in-app products. These users might have to purchase the in-app items like all other users. We apologize for any inconvenience this may cause."