Scrolling to the bottom of the page in the App store reveals a Redeem button which is used to redeem an iTunes Gift Card.
with a credit card
yes
Either enter a valid credit card or buy a prepaid iTunes card.
Yes ,you can.
The 'iPay' system enables consumers to pay for purchases on iTunes using on-line credit. This makes the system similar to using a credit card, however you can only use this credit on iTunes.
iTunes FreeNo, you don't have to pay to have an iTunes account.
If the firmware update requires you to pay for it (example: 3.0 or 3.1 firmware), then yes, the iTunes gift card can be used to pay for the firmware.
If you have not put a credit card on the itunes then there is no money. Also, you can but an itunes card and then press redeem. That works too!
Yes
One can pay for items in the iTunes store with a valid credit card or an iTunes gift card. One can make the valid purchase through their iPhone, iPad, or Mac computer or over the phone with an apple representative.
When you pay for credits, you will get a voucher. A voucher is a number that you type in to get the same amount of money as you did, but not pay, so DO NOT forget your voucher!