Our app was rejected in App Store because we were using 3rd party solution for subscription and was decided to use In-App Purchases ( Auto-Renewable Subscriptions). I went through several tutorials and it seems that the subscription has to be created in App Store Connect and only then it will be available to use in app and that's the problem for us.
Our app is something like news app where user can subscribe to some author. List of authors comes from server therefore hardcode every subscription for each author is not the way to go.
So, Is that possible to somehow implement what I want with In-App Purchases? Thanks.
Dynamic Auto-Renewable Subscriptions creation (and dynamic in-app purchase creation in general) is not possible. Alternatives would be to sell credits to authors (but this is non-auto renewable). Another possibility is to sell tiers of subscriptions that grant access to a number of authors.