At this point I don’t know what to do, I don’t want to create a registration to store user’s info in some remote database, simply because my app promises to keep all data on user’s device without sharing it in any way. But my app was rejected even after my explanation that the app uses AppleId, so it should be available on all user’s devices. I’m thinking to try RevenueCat, maybe a different implementation will somehow change reviewer’s mind. Though it will not provide any registration either.

Thanks for the response! Yes, I have "Restore Purchases" button, when I resubmitted with an explanation, the reply was the same, so I'm confused. Here is my reply to the reviewer: Subscription is linked to user's profile, in my app I let user "restore purchases", pressing that button will add purchased subscriptions, this way user can have the app's subscriptions on all devices that are using Apple ID that was used to buy the subscription.

Thank you! This solution worked as expected, I missed in docs this initializator init(from decoder: Decoder) throws.

Sorry, I didn't put that in: let y = "0.94". In the end I need to convert String to NSDecimalNumber but it seems to be impossible without converting it to Decimal first. So, the result shouldn't be a String, it should be a Decimal or NSDecimalNumber.