Why does mobile Alipay suddenly need a mobile phone verification code?

When the Alipay account pays for the transaction, the Alipay security system will verify the comprehensive situation of the account use and verify that there are risks in the account use. The system will automatically trigger the SMS check code for secondary verification, which is also to ensure the safety of account use. It is recommended to enter the verification code to complete the payment, and the content of the SMS verification code should not be leaked.