I have money siting in my xbox account through prepaid cards that I would like to use to buy stuff on xbox.com. However, when I go to purchase things, I only see my credit card listed as a payment option. I would think that I would have the option to use whatever payment method I wished, like the way it is on the console. Do I need to remove my credit card from my account in order to use the prepaid money or am I doing something wrong? Thanks!