In the Wallet app, you can check the balance of your Apple Account, add money, and redeem Apple Gift Cards. Use your Apple Account balance to buy products, accessories, games, apps, subscriptions like iCloud+ and Apple Music, and more. You can even use your Apple Account balance as a quick, convenient way to pay at the Apple Store (not available in all countries and regions) or apple.com.
Go to the Wallet app on your iPhone.
Tap Apple Account, tap Sign in and manage your Apple Account on iPhoneAbout Apple Wallet on iPhone