I'm switching from Java to Flutter. My actual Java app has about 100 subscribed users and I can't keep their subscription in Flutter using the official in_app_purchase plugin because it doesn't support the verification.
I'm looking for a solution so I found RevenueCat. It seems the most preferred choice but I don't have the app_user_id required for the data migration. The same happens with Adapty.
Does someone did it before?