Q: Trying to pay with gift card, but iTunes asking for bank card update

Hi obxmoon,

For assistance with your issue redeeming your gift card, you may want to look at the information in this article -

Redeeming iTunes Gift Cards and content codes

http://support.apple.com/kb/ht1574

Where it says Get help -

• You might not be able to use your credit if you see a message that your credit is temporarily unavailable. You can try again later.
• You can use store credit to purchase items until the credit is gone. See how much credit you have left.
• Your iTunes account can have gift certificates, prepaid cards, allowance credits, and free song credits at the same time. Learn how your purchases are billed.
• You need a credit card to purchase an iTunes Gift online.

Thanks for using Apple Support Communities.

Best,

Brett L