CID Location on AMERICAN EXPRESS Cards
American Express users often experience difficulty placing orders online and the main reason is that the security code is not the three (3) digits located on the back of the card but rather four (4) digits on the front of the card, superimposed above the last digits, as illustrated.
CVV2 Location on DISCOVER, MASTERCARD or VISA Credit Cards
On all other credit cards such as Discover, MasterCard and Visa, the CVV2 is a three-digit security number printed on the signature panel on the back of the card immediately following the credit card account number as illustrated.
We request this security code to ensure that the card is in your possession and to safeguard against fraudulent transactions.