credit cards and debit cards. On your American Express branded credit or debit card it is a 4 digit numeric code. Sure, and suddenly youre prompted for your cards CVV or security code. The American Express security code also called a card identification number. One way for phishers to gain your CVV is to send a legitlooking email. Check your statements for suspicious activity. While you might save your card number and personal information on a merchants website. Avoid saving your personal data on retailer websites. Dont click links in suspicious emails. Its convenient, you still need to be vigilant when it comes to your cards security. N umber, you usually have to type in your CVV each time you make a purchase. Security, cVV is a new authentication procedure established by credit card companies to further efforts towards reducing fraud for internet transactions. MasterCard uses the CVC or CVC2 code. Many ask for your CVV code to verify youre the rightful owner of the credit card. Your cards CVV is different from your PIN personal identification number which you may have created when you opened your account.