To use face-brushing payment in Alipay, it is necessary to ensure that the latest version of Alipay is installed on the mobile phone and the face-brushing function is supported. Open Alipay application, click "Settings" and "Payment Settings", and open "Brush Face Payment" in "Biometrics". After face recognition is completed, the payment can be completed by aiming at the camera of the mobile phone when shopping or paying.