Matt Berg April 27, 2009
The card security code is a unique three or four digit number, separate
from your credit card number. Your security code can be found in the
following locations on the following cards:
Visa/MasterCardYour card security code for your
MasterCard or Visa card is a three-digit number on the back
of your credit card, immediately following your main card number.
American Express The card security code for your American
Express card is a four-digit number located on the front of your credit
card, to the right of your main credit card number.
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