Q: Can I use iTunes gift cards to purchase an app?

Yes.

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It’ll remain for later usage.

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Redeem the card and buy the application normally.

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aRjAyR wrote:

 

How can I use this iTunes gift card to purchase an app? Can you help with the steps? Thank you so much

Try visiting this page, there are many instructions on how to redeem your itunes gift card here

All the steps should be there for you!

Redeem iTunes Gift Cards and codes - Apple Support

On your iPhone, iPad, or iPod touch

1. On your device, tap iTunes Store, App Store, or iBooks Store. iTunes Store Gift Card amounts are credited to your Apple ID, so you can use them in any store as long as you sign in to each store with the same Apple ID.
2. Scroll to the bottom of the Featured section and tap Redeem.
3. Sign in with your Apple ID. Learn what to do if you forgot your Apple ID.
4. Tap "You can also enter your code manually." In some countries, you can redeem gift cards using your built-in camera.
5. If you have an iTunes Store Gift Card, enter the 16-digit code, which starts with X, from the back of the card.
   If you have a promo or content code, enter the code from the back of the card.
6. Tap Redeem. Learn what to do if you see an alert message or can't redeem your iTunes Store Gift Card or content code.