"Travel Code" can display the information of countries (regions) that users have visited in the past 14 days and cities that have stayed in China for more than 4 hours, and can be used to prove whether the person has been to key epidemic areas and countries in the past 14 days. In our daily life, we are often asked to show our travel code. We can automatically generate the travel code by entering the mobile phone number in WeChat-Search-the State Council Client applet-Epidemic Prevention Travel Card.