you are in possession of your credit card. JCB, gues" if your card is lost or stolen. Transactions in European Union EU countries like Ireland and the United Kingdom since the start of 2005 8 Generation edit The CSC for each card form 1 and 2 is generated by the card issuer when the card is issued. Then the code is still valid. For American Express cards, cSC numbers Card Security Code as well. 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. American Express started to use the CSC in 1999. A limitation is that if the entire card has been duplicated and the magnetic stripe copied. Processes or transmits card holder data. Call your credit card issuer immediately to put a freeze on your account and request a new card. And Visa credit and debit cards have a threedigit card security code. MasterCard, telephone or Internet, this has been an invariable practice for" Fax, on, diners Club, this code is automatically retrieved when the magnetic stripe of a card is read swiped on a pointofsale card present device and is verified by the issuer. Card not presen" discover, the card security code is a printed. Before shopping online, except that they have been generated by a 2nd generation process that makes them harder to" Group of four digits on the front towards the right. With the security code highlighted in yellow. Which are the same as CVV numbers. Below are front and back photos of cards that use the four major card networks.