What does the professional customer in Metro's order mean?

Professional customers are mainly hotels, restaurants, canteens, small and medium-sized retailers, enterprises and institutions. Metro adheres to the business-to-business concept, that is, only professional customers who show their business licenses and other relevant documents, register and apply for Metro membership cards can buy in Metro. Metro Supermarket is a retail and wholesale supermarket group, which owns several Metro cash-and-carry shopping malls with Metro and Wankelong brands.