Credit Card Security Code
Credit card security codes vary by location and number of digits.
 
American Express
The security code is a 4-digit, non-embossed number printed above your credit card number on the face of your card. This number is requested as an additional security precaution.		 Card image with security code  
 
Visa/MasterCard/Discover
The security code is a 3-digit, non-embossed number printed on the signature panel on the back of the card immediately following the last 4 numbers of your credit card number. This number is requested as an additional security precaution.		 Card image with security code  
 
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