Check the bank card. It can only be viewed through the bank card. Cvc code is the last three digits on the back of the bank card, which is the check code of the bank card. Query channels can only be viewed through bank cards. Cvc code, that is, credit card security code, is the security code of credit card in online or telephone transactions. Generally, it is a 3-digit or 4-digit number printed on a credit card, and the printing position of different types of cards will be different.