I need help! I have money from gift cards in my account, but I cannot buy anything! I want to buy a John Green book before this weekend. Amazon keeps asking me if I want to use a credit card. When I try to purchase I get a message that says: For your convenience, all Kindle orders are completed with 1-click. We could not complete your order because you do not have any valid credit cards specified for your Amazon.com user account. Can you please help me?
Added (1). I know gift cards are not credit cards.
Read more: How to purchase items in the Amazon Book Store?