Instead, you have to go through a series of steps that aren't entirely intuitive. To add your Apple gift card balance to your Apple Wallet: Open the Apple Wallet app. Tap Add Apple Account.

The iPhone's Apple Wallet is a convenient way to quickly access credit and debit cards, but it can store more than that. You can also add and use gift cards, loyalty cards, boarding passes, and ...

Apple Card requirements: You need to be 18 years or older, depending on where you live. Applicants must be from the USA; either a U.S. citizen or a lawful U.S. resident.

Tap on your Apple Gift Card purchase in your transaction history. This will open your App Store Code, which is essentially a 16-digit code that you can redeem on your App Store purchases.