If a user subscribes to Premium in the Fountain app, does the App Store take 30% each month as an in app purchase fee? If so, could a user just zap the @Fountain Nostr account 50,000 sats for a Premium subscription for a year, and then someone on your end upgrade the zapper’s npub to Premium? Or would that be too much admin work and it be easier to just have the user subscribe in the app a let the App Store take their cut?