Why does WeChat payment need SMS verification code?

Part of the reasons why WeChat payment needs SMS verification code are as follows:

When the daily limit of change payment for other accounts under the name reaches 2000 yuan, a verification code will be sent to the reserved mobile phone number to verify whether the bank card is bound to relatives and friends or other WeChat accounts. After receiving the verification code, it means that others have not embezzled the funds of the bank card and are in a safe payment environment.

If you transfer money to a contact who is not in the mobile phone address book, the system may regard it as a stranger's operation, so as to verify whether it is my operation through the mobile phone number verification code.