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What is the credit card security code? Some credit and debit card companies print a security code on their cards, as an additional way of verifying and validating the card. Since you can only get the number from the card, it is difficult for anyone other than the actual cardholder to know the code. On MasterCard and VISA cards, the security code is a 3-digit number printed in the signature area on the back of the card, following the card number. On American Express cards, the security code is a 4-digit number printed above the card number on the front of the card. |