Full version license from an in-App purchase.

Hello,

I'm currently selling an app on the Apple Store but I think I made a mistake. I would have preferred to offer a free trial version on the store and allow the purchase of a full version license from an in-App purchase.
Is this possible? Is it possible to make the application free on the store and offer an in-App to get the full version? And how to manage people who have already purchased the paid version from the store (i.e. convert an application purchase into an In-App)?

Also, I would like to offer an iOS version of my app. Can I set a different price for the macOS and iOS versions?

BTDT - for an iOS app: I used the version information of the original purchase in the receipt to distinguish if the user has purchased the app before I made it freemium: Former customers get the full functionality enabled, others are working with a trial version and need to use IAP to unlock all functions.

Works like a charm for years.

Greetings, Mattes
Thanks Mattes !

I use Qt to access to the in-Apps and see if they have been purchased.

But there was no in-App in the application when I offered the program on the App Store.

So how can I access to the original purchases and the receipts?
Full version license from an in-App purchase.
 
 
Q