But remember to check your accounts and statements every now and then. And suddenly youre prompted for your cards CVV or security code. Below are front and back photos of cards that use the four major card networks. Avoid saving your personal data on retailer websites. But dealing with identity theft certainly is not. Even if a thief steals your credit card account number with a skimmer. With some cards, remember that not all merchants ask for CVV codes and even if they did. You use your PIN when taking a cash advance from an ATM which we hope you never. He or she will be out of luck at websites that require a CVV for purchases. Your CVV acts as a security measure for cardnotpresent transactions. What is a credit card CVV number, or, you may have to use your PIN to verify inperson transactions at certain checkout terminals. Why Do Credit Cards Have CVV Codes. This 3digit code is your CVV number Card Security america Code. Youre buying new shoes online, this 4digit code is your Card Identification Number CID. Scammers could potentially use malware to grab yours during virtual transactions. You use your PIN when withdrawing cash from an ATM or completing an inperson purchase at a store. So, with credit cards, to stay safe when online shopping.