Alipay is an affiliate of Alibaba. Alipay has developed a health rating system from a QR code. It was the quickest answer the China government has chosen to contain the spread of the Covid-19 epidemic.
The system generates green, yellow, or red code based on answers to a few basic questions. Individuals with a green code are allowed to move around the city freely, yellow codes require a seven-day quarantine, and red requires a 14-day quarantine.