You can only use a gift card in the same country or region where it was purchased. A US iTunes card will not work on a UK Apple ID.
Once the balance is in your account, the App Store will automatically draw from that credit before charging your linked credit card or PayPal account. What You Can Buy can i buy apps with itunes gift card
Older iTunes-specific cards are generally restricted to digital content. While the newer "Universal" Apple Gift Cards can be used at the Apple Store for MacBooks or iPhones, older legacy cards may be limited to the App Store and iTunes Store. You can only use a gift card in
To buy an app using a gift card, you must first redeem the code: Open the on your iPhone, iPad, or Mac. What You Can Buy Older iTunes-specific cards are
Tap your at the top of the screen.
Historically, Apple sold specific "iTunes Gift Cards" for media and "App Store Gift Cards" for software. Today, Apple has largely unified these into the . However, if you have an older card specifically labeled "iTunes," it is still valid. Once redeemed, the balance is added to your Apple Account Balance , which acts as a universal wallet for Apple services. How to Use the Balance for Apps