Yea, Go to iTunes app. Click "Redeem." Enter-in or let it auto-photo the itunes code on back. You now have that as store credit. Anything you buy/download from App Store or iTunes (including games) will use the store credit balance first, but if it goes over it, it'll then tap into your saved credit card for the acct.
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In two weeks...
Any guess who might " now " be on my list, ( in 2017 )