As an individual entering and leaving electronic certificate locally, the QR code can be declared once, which is universal in the whole city.
On March 5, 2020, the draft of the Reference Architecture and Technical Guide for Epidemic Prevention Codes (hereinafter referred to as "Standards") passed the review of the expert review meeting and was formally submitted for approval. The promulgation of this standard provides technical specifications for the development enterprises of epidemic prevention codes, and regulates and requires the functions required for personnel management, authorization management and collection point management of epidemic prevention code users.