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When paying by credit card, Sell.com requires additional information to help protect you against fraudulent charges.
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Visa, MasterCard, and Discover cards have a 3-digit Card Security Code (CSC) on the back. This is the non-embossed number printed on the signature panel on the back of the card (immediately following the card number).
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American Express cards have a 4-digit Confidential Identifier Number (CID) on the front. This is the 4 digit, non-embossed number printed above your account number on the front face of your card.
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