Facebook allows its users to store payment information such as PayPal and credit cards to pay for services including advertising and game credits. However, not everyone is comfortable with the idea of keeping financial details on the site. If you ever decide you no longer want to use PayPal in your Facebook transactions, you have the right to remove it. You can do the same with credit cards.
Sign into your Facebook account.
Click "Account Settings" under "Account" on the top right of the page.
Click the "Payments" tab.
Click "Remove" next to your PayPal payment information.