Why does WeChat Pay suddenly need SMS verification code?

There are two situations when WeChat payment needs verification code: 1, and the change payment amount is more than 2,000 yuan. At this time, the verification code must be triggered and cannot be cancelled. Only after entering the verification code can the payment be successfully made. Solution: the verification code 2 will not appear when the bank card is paid quickly, and the use environment is unsafe. This can be solved by changing a safe environment or entering a verification code.