General info
Spoiler
- You cannot currently buy any Xbox 360 content on xbox.com using your account balance, you can only use an active credit card or PayPal. To use your balance, you must make purchases on your console. Unfortunately, even "purchasing" free content through the web site like trials requires an alternative method of payment tied to your account, though adding an empty MasterCard / Visa gift card that is...
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Source: https://www.cheapassgamer.com/threads/x ... on.371393/