Add money to your Apple Account balance - Apple Support

Apple Gift Card - Apple

Intro to Apple Card on the Web - Apple Support

How to Check an iTunes / App Store Account Balance Quickly from iOS & Mac OS X

What is Apple ID balance and how to use it on iPhone, iPad, and Mac

Set up and use Apple Card on iPhone (U.S. only) - Apple Support

How to make Apple Card payments - Apple Support

Add a payment method to your Apple ID - Apple Support

Wallet App Now Supports Apple Account Cards on iOS 15.5 - MacRumors

If you need to change or update your Apple ID payment method - Apple Support

Apple Account balance - All of Apple. At your fingertips.