Need assistance regarding In-App Purchase

Question

Currently my is a paid app, now I am planning to make it free with limited functionality, after in-app purchase user can have full functionality. I want to know the people who have purchased previously can directly restore purchase so they don't have to buy again.

Answer 1

Apple doesn't allow to make this automatically. You must do this in your code. For example check your apps version, like version < x.y.z means that it was paid before, version >= x.y.z means this is a new user which should make the in-app-payment to unlock the full version.

Answer 2

No. There is no way to get such things from Apple. But, you can do one things.

If you're having login feature then you can manage same things from date. So, for old registered need to show all features while new users need to show specific features only.