1, tools/raw materials
bank card
2. Check the last three digits of the signature column on the back.
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.
Extended data:
Remember to protect the last three yards when shopping online with a credit card.
In some online shopping websites, credit card payment can be completed without entering a password. For example, in Amazon shopping website, in "one-click payment", you only need to enter the cardholder's name, card number, reserved mobile phone number, expiration date and the "last three codes" on the back of the card to successfully pay.
In addition, many large airlines, travel booking websites and hotel websites in China can also use credit cards to pay, and the "last three yards" can also be used. For example, domestic one-way travel and Ctrip travel provide such confidential transactions in hotel and travel reservations.
According to bank security experts, because some websites (especially overseas websites) don't need passwords for online payment with credit cards, the importance of the "last three codes" of credit cards is almost equal to passwords.
However, in the process of online payment, cardholders often don't realize that they are using another "password" and also need protection. In the face of social fraud, if the cardholder accidentally reveals the "last three yards", it will directly lead to the risk that the card will be stolen.
The staff of the Credit Card Center of the Postal Savings Bank introduced that if the credit card does not involve large-value transactions, it is best to set a credit card limit to prevent the card from being stolen and causing losses.
References:
Baidu Encyclopedia-Last Three Codes
References:
People's Network-Cover it up! The last three digits of a credit card are as important as the password.