Can you pay an iTunes bill with an iTunes card?

You can buy iTunes gift cards at any store that sell them, including WalMart as an example. Then you redeem the gift card to your iTunes account. Next you view the items on the store and when you buy it is automatically setup to use your gift card (store credit) before your credit card or other payment method is used. If you did not have store credit, the system will charge your other payment method, for example Paypal, Click&Buy, Credit Card.