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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 CID number.
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 CID
number.
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 CID number.
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