Pawn Stars does not save your credit card information, this is done through Facebook. However, here are instructions for removing your credit card information from Facebook:
1. Open your Internet browser, and log onto your Facebook account.
2. Click Account Settings under Home on the right side of the screen. In a moment a new page appears on your computer monitor.
3. Click the Payments link in the left side of the page.
4. Select Manage next to Payment Methods and your currently saved payment information is displayed. Click on every line of card information (ranging from your name to card number) and delete everything. Click Save, and the data is completely removed from your Facebook account.