ITunes gift card help on iPhone?

So I redeemed all my gift cards on my computer and now I want to buy a song or app on my iphone. When I pressed buy song it asks for my password and I'm afraid it'll charge my credit card instead of the gift card.

Enter the password.

Well if your too afraid of that, to go your Apple ID and remove your credit card information for now. But I think it should go for your gift card balance first or let you choose the method of payment.

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