The term 'Mantou door photo catering business license' refers to a type of business license required for a catering business located at a Mantou (steamed bun) shop. In China, catering businesses must obtain a license from the local administrative office to legally operate. This license is usually displayed prominently at the entrance of the business, hence the term 'door photo'. It serves as proof that the business complies with health, safety, and other regulatory standards.