No, the National Health Bureau stipulates that employees in all service industries must apply for health certificates, including catering, hotels, supermarkets, domestic service and so on. Employees in these industries must have one person and one certificate, and the Health Bureau will conduct random checks from time to time. So the health certificate is not for the catering industry, but for the service industry.
You can go to the epidemic prevention station or the CDC to apply for a health certificate.