What is a three-yard card in Sichuan Province?

Health code, travel code, location code and peer secret check card. "Three codes and one card" is a personal QR code generated by self-service online declaration and verification based on personal real data and epidemic prevention big data information. These things are important passes in current life and travel. Many places, such as hospitals and shopping malls, need to show personal information when entering. "Three codes and one card" refer to health code, travel code, place code and point-to-point self-check card respectively.