Did you try this? Xbox 360 made it possible to buy a Live Account and Marketplace points without a credit card – so we apologize for the following inconvenience if you’re a 360 owner with no credit card attached to your Live account, but thanks to Halo 2’s olde school tech, this is the simplest way to do it: Account Management 1. In the Xbox Dashboard, select the profile that you want to modify, and then select Account Management. 2. Select Memberships. 3. Select the membership that you want to update. 4. Select Change Payment Options. 5. Select Add Credit Card. 6. Enter the credit card information for the card that you want to add. This can also be a debit or Visa (or similar) gift card, however, some restrictions may apply.