Next to the magnetic strip on the back of the card. According to the information on the official website of China Merchants Bank, the credit card security code is a security code for credit cards when conducting online or telephone transactions. It is a 3 or 4-digit number printed on the credit card. The printing position will be different for different types of cards. The CVV code of China Merchants Bank credit card is on the back of the card next to the magnetic stripe. Therefore, the CVV code of China Merchants Bank credit card is next to the magnetic stripe on the back of the card.