How do use my ITunes balance to pay for Apps
How do use my ITunes balance to pay for Apps?
iPad (4th gen) Wi-Fi, iOS 7.0.4
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You just buy what you want. If you have a credit (balance), it is automatically used before you are billed (if you run over your balance).
How to manage unused iTunes Gift Card and Gift Certificate balances
"Each time you purchase content, iTunes will deduct funds from the credit until it's depleted."