My apps all use the same Firebase authentication and Realtime Database, allowing them to have one account for all of my apps.
There is one concern about one thing though.
Apple has before rejected apps for not using the Apple Pay payment system, but instead using Stripe. I have my own currency service that aren’t in a form of real money. Can I use this virtual currency for my apps in-app purchases?
(P.S. This currency is saved by the user’s Firebase Authentication so they can have a personal currency and is saved by the Realtime Database)