Introduction to use, (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. Note that this verification code does not refer to the password of the credit card, just enter the bank card number and its last three digits, as well as the validity period of the credit card, and there is no password at all. At noon yesterday, the customer service staff in Ctrip.com told the reporter that the information needed to purchase air tickets by credit card is: card number, credit card validity period, "last three" verification codes, and cardholder ID number. ?
Effectively prevent account theft.
User panic behind convenience. "The last three codes are extremely critical in offline transactions, which brings convenience to cardholders' consumption and convenience to merchants. We cooperate with qualified merchants. The merchant freezes part of the funds before the cardholder's consumption, and after the cardholder signs, the merchant can formally deduct this part of the funds.