When I go to make a purchase, I am only asked for credit card info. There is no option for gift card.
http://support.apple.com/kb/ht1574
I normally redeem the card first to load up the account. Then once redeemed, I make a purchse.
Cheers
iTunes Store: How to use your iTunes gift certificate - http://support.apple.com/kb/HT2737
iTunes Store: How to redeem a code - http://support.apple.com/kb/HT1574 - If you have an iTunes Gift Card or other code that you want to redeem in the iTunes Store. Includes hierarchy of how things are charged.
Some things cannot be purchased with gift cards.
How do I redeem an iTunes gift card on my phone?
