Visa / Mastercard / Discover: Flip your card over and look at the signature
box. You should see either the entire 16 digit credit card number or just the last
four digits 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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