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Discover Card
Users Flip your card over and look at the signature box. You should see
a 16-digit credit card number followed by a special 3-digit code. This 3-digit
code is your CID, like VISA and MasterCard.
Visa Credit Card
Users Flip your card over and look at the signature box. You should see
a 16-digit credit card number followed by a special 3-digit code. This 3-digit
code is your Card Security Code.
MasterCard
Credit Card Users Flip your card over and look at the signature box. You
should see a 16-digit credit card number followed by a special 3-digit code.
This 3-digit code is your Card Security Code.
American Express Credit Card Users Look for the 4-digit code
printed on the front of your card just above and to the right of your main
credit card number. This 4-digit code is your Card Security
Code.

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