How to Redeem Apple Gift Card on Mac Type in your login details and click on "Sign in" to continue. Now, you'll find the option to enter your gift card code. Type in the 16-digit code and click on "Redeem".\ That's all there is to it. Now you know how easy it is to redeem a gift card on your Mac. Once redeemed, the gift card's value will be added to your account as Apple ID Balance.