I have a balance in in my I-tunes account but when I try to purchase a book I'm asked for billing information. Why isn't it deducting purchase from my I-tunes account?
I have a balance in my I-tunes account but when I try to purchase a book I am asked to confim my billing information for a credit card rather than deducting from the I-tunes balance. How can I get the purchase deducted from my balance rather than using a credit card?
iPod touch, iOS 6.1.6