iTunes Gift Card code is redeemable for apps, games, music, movies, TV shows and more on the iTunes Store, App Store, iBooks Store, and the Mac App Store. Recipients can access their content on an iPhone, iPad, or iPod, and watch or listen on a computer – Mac or PC.
Important Note:iTunes Gift Cards are country-specific. If you're trying to redeem a gift card that was purchased in a different country, make sure that you're redeeming it in the same country's iTunes Store. You can't redeem gift cards outside of the country of purchase. For example, a gift card purchased in the United States can't be redeemed in an iTunes Store in Australia.
To redeem iTunes Gift Card on your iPhone, iPad, or iPod touch:
To redeem iTunes Gift Card on your Mac: