How to Redeem an iTunes Gift Card

Go to this website: Visit the Apple website at https://www.apple.com/redeem or open the iTunes Store app on your device.
Log in to your account: Enter your Apple ID and password to log in to your account.
Enter your gift card code: In the provided field, enter the code from your iTunes Gift Card.
Apply the gift card: Click “Redeem” to add the gift card balance to your Apple ID.
Start shopping: Use your balance to purchase music, movies, apps, and more from the iTunes Store or App Store.