What does the Tibetan Yitong paper code mean?

According to relevant information, the paper code of Yitong in Tibet means paper hygiene code in Tibet. Do people need to be healthy when they go out because of the epidemic? Can Tibetan medical experts show the health of Tibet? Some elderly people can't use mobile phones, so they have a paper health code, which is a paper health code in Tibet. So the paper code of Yitong in Tibet is the paper hygiene code of Tibet.