Finding Your Credit Card Security Code
Visa, Mastercard & Discover card holders
Flip your card over and look at the signture box. You should see either the entire 16-digit credit card number or just the last four digits followed by a special 3 or 4 digit code. This 3 or 4 digit code is your Credit Card Security code.
American Express card holders
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 Credit Card Security Code.