CVV is Card Verification Value, while Mastercard is called Card Validation Code (CVC). VISA CVV and MC CVC are both 3-digit or 4-digit numbers generated from the card number, validity period and service constraint code. They are generally written in the 2-track user-defined data area of ??the card's magnetic stripe. The generation methods of CVV ??and CVC are the same, but they are called differently. CVV2 is a number printed in the signature area of ??a Visa/MasterCard card. It is the 3 digits after the credit card number. The last three digits we usually see on the back of credit cards are actually CVV2, not the CVV code. \x0d\\x0d\Introduction to Credit Card Verification Code CVC\x0d\ CVC (Card Verification Code) is an additional code printed on the back of the credit card, also known as CVV (Card Verification Value). CID is credit card security code or personal security code, etc., all names refer to the same verification code. It appears on the back of the credit card, at the top of the signature area in italics. The first four digits are the card number, and the last three digits are the verification code used by commercial banks to ensure the security of bank card passwords. CVV2, CVC2, CVN2, and CSC2 are verification codes, which are used by bank cards for indirect transactions such as online payments. CVV2, CVC2, CVN2, and CSC2 can identify the presence of bank card transactions. It can usually be found in the last three digits of the signature strip on the back of the bank card. The UnionPay standard card organized by UnionPay is called CVN2, the MasterCard card is called CVC2, the VISA card is called CVV2, and the AE Express card is called CSC2. The verification code generation principles corresponding to their names are the same, but different organizations have different names. \x0d\CVV Verification Code\x0d\ CVV password verification refers to commercial banks adding a custom encryption algorithm verification code (CVN) to the bank card number encoding rules and magnetic stripe data format they use. The relevant bank cards are also called For CVN bank card. \x0d\　CVV information is stored in the track of the magnetic stripe bank card. Based on the card number, track master account number, card-issuing bank logo code and other information, it is encrypted through a special encryption algorithm customized by each bank. Wenbu uses CVKA technology to encrypt. Get verification code. Since the encryption algorithms of different banks are different, some counterfeit cards illegally produced using the obtained bank card information can be identified and cannot be used when the card issuer decrypts them. \x0d\The difference between CVV2 and CVC2\x0d\ CVV2 and CVC2 are also card verification values ??derived from the same algorithm, but they are printed on the signature strip when the card is generated. \x0d\　CVV/CVC is verified during online transactions (card swiping), and CVV2/CVC2 is verified during off-site transactions/manual transactions (card cannot be swiped).