The security code is three digits to the right of the signature position on the back of the card. Nothing else. Account alias is optional, that is, you give this card a name or indicate its main purpose for your own management and identification. The account password is to swipe the card or take the current password. The verification code is a 6-digit code, which is sent to your mobile phone by SMS and then entered.
Extended data:
Credit card, also known as credit card, is a credit certificate issued by commercial banks or credit card companies to eligible consumers. Consumers with credit cards can go to specialized commercial service departments for shopping or spending, and then the bank will settle accounts with merchants and cardholders, and cardholders can overdraw within the prescribed limits.
China's relevant laws ("NPC Standing Committee on
References:
Baidu encyclopedia-credit card
References:
China Construction Bank official website-Frequently Asked Questions on Credit Cards