Buyers can redeem gift cards at the retail store or through the website of the company that issues the gift cards. Companies such as Apple issue various types of gift cards and promotional codes, and they have specific directions on how to redeem each of them.
An iTunes Store gift card is redeemable through the iTunes Store, App Store, iBooks Store or Mac App Store. The Apple Store gift card is redeemable online or at an Apple brick-and-mortar store. Certain codes are redeemable through email. For specific questions about how to use a gift card, buyers should contact the issuer.