If you buy an Apple Gift Card or add money to your Apple ID, the balance can be used to buy products in the Apple Store as well as apps, songs, movies, and subscriptions.
Currently, users can check this balance by going to the App Store or by adding the iTunes Pass to the Wallet app. At the same time, this pass has a QR Code that can be used to purchase products in Apple Retail Stores. With iOS 15.5, Apple is finally revamping the iTunes Pass.
Interestingly, the Apple Account card will have a parallax effect in the Wallet app, just like the Apple Card and Apple Cash card. The feature is currently disabled even for beta users, but it will likely be officially announced with the public release of iOS 15.5.
Your account balance can be used to buy products, accessories, apps, games and more online or in store with Apple Pay.