| Visa, MasterCard, and Discover: the CSC is the last 3 numbers printed on the back of the card in the signature field. |
Card Security Code "CSC" |
| The Card Security Code (CSC) is a number separate from the credit card number that is printed on your credit card. It is used to help with fraud prevention by verifying that you have the physical card in your possession. If your card has a CSC we require that you enter it. |
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American Express: the CSC is the 4 non-embossed numbers printed on the front of the card above the credit card number. |
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