Apple appears to have recently updated the Wallet app to allow users to add an Apple Account card, which displays the Apple Credit balance associated with the Apple ID.
For example, if you receive an App Store or Apple Store gift card, it is added to an Apple account that previously appeared in the App Store and Apple Store apps. Starting today, Apple Account balances can also be added to new cards in the Wallet app.
To add a card, open the Wallet app and under “Available Cards”, tap “Add Apple Account”. As long as you have an Apple account balance, you can add cards.
Once added, you can view your Apple account balance directly from the Wallet app and use it to purchase Apple products, apps, games, and music. It works the same way as any other card in the Wallet app when you’re in the Apple Store. The Apple Account card replaces the iTunes Pass which was around for a long time.
The Apple Account card can be added on devices running iOS 15.5 or later.