The first four digits are the last four digits of the bank card number. The last three digits are the security code.
The security code of China UnionPay is called CVN2 (card verification number 2), which has 3 digits and is printed after the 4 digits of the card number on the back of the credit card.
China UnionPay specially reminds that the cardholder's ID number, bank card number, password and SMS verification code, as well as the credit card validity period and verification code (CVN2, the last three digits of the number signed on the back) are all important information related to the security of account funds, so please keep them properly.
Special reminder, any online shopping refund does not need to provide bank card password and CVN2. Any behavior of asking for SMS verification code is fraud.
Extended data
The security code of VISA card is called CVV2 (card verification value 2), which has 3 digits and is printed on the last 4 digits of the card number on the back of the credit card.
The security code of MasterCard is called CVC2 (Card Verification Code 2), which has 3 digits and is printed on the last 4 digits of the card number on the back of the credit card.
The security code of the discovery card is called Cardmember ID, which has three digits and is printed on the signature column on the back of the credit card.
The security code of American Express Card is called CID (Card Identification Number), which has 4 digits and is printed on the front of the credit card above the credit card number.
The security code of JCB card is CAV2 (card authentication value 2), which has 3 digits and is printed on the last 4 digits of the card number on the back of the credit card.
Classification method:
Under normal circumstances, bank cards are divided into credit cards and debit cards according to whether credit lines are granted to cardholders.
In addition, bank cards can be divided into magnetic stripe cards and chip cards according to different information carriers;
According to whether the issuer is in China, it is divided into domestic cards and overseas cards;
It is divided into personal cards and unit cards according to different issuers;
According to the different currencies of accounts, they are divided into RMB cards, foreign currency cards and dual currency cards.