(CardVerificationValue), that is, the credit card verification value. The display position is on the back of the credit card, and the top of the signature is displayed in italics. The first four digits are the card number and the last three digits are the verification code, that is, the last three digits.
The last three digits are the last three digits on the back of a series of cards, which are generated by the coding rules and encryption algorithm of the issuing bank. In the payment process, if the merchant provides the last three codes to the bank, the bank will obtain the authorization of the cardholder to the merchant by default, thus allowing the transaction.
The use of credit cards can be divided into "on-card transactions" and "off-line transactions". In the former, the cardholder swipes the card at POS terminals such as shopping malls and supermarkets, signs the authorization, and then completes the transaction. Offline transactions are common when cardholders book hotels, air tickets or pay online. The merchant also provides the credit card account number and the last three codes through the POS system to complete the transaction.
The last three digits are the last three digits on the back of a series of cards, which are generated by the coding rules and encryption algorithm of the issuing bank. In the payment process, if the merchant provides the last three codes to the bank, the bank will obtain the authorization of the cardholder to the merchant by default, thus allowing the transaction.
As shown above, below the black magnetic stripe is the signature column, and the last italicized number 123 in the signature column is the last three digits of the credit card.