What is CVV2? 
In a word -- Security!            
The customer verification number is a non-embossed number located on your card that cannot be obtained easily by using an imprint of your card or simply copying down the account number.
Visa, MasterCard & Discover
If you are using a Visa, Mastercard or Discover, please provide the 3-digit verification number found on the back of your card.
American Express:
If you are using an American Express card, please provide the 4-digit verification number found on the front of your card.
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