Add money to your Apple Account balance - Apple Support

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

You can now use Apple Pay for iTunes, App Store, Apple Music, and more - The Verge

Sign in with your Apple ID - Apple Support

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

Apple ID Balance vs. iTunes Credit Amount - Apple Community

How To Add Apple Account Balance To Wallet

Apple Cash - Official Apple Support

Apple Gift Card - Apple

Apple savings account for Apple Card has arrived -- here's how to get started - iOS Discussions on AppleInsider Forums

apple account balance showing zero - Apple Community

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