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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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