What you want to ask is that catering service providers are not allowed to purchase without any documents? Food, food additives and food-related products with relevant licenses, business licenses, product qualification certificates, animal product quarantine certificates and other certification materials. According to the inquiry of Hualv. com, catering service providers refer to food, food additives and food-related product certificates that units and individuals engaged in catering services need to hold relevant licenses, business licenses, product qualification certificates, animal product quarantine certificates and other certification materials. Catering is a food production and operation industry that provides consumers with all kinds of drinks, food, consumption places and facilities through instant processing, commercial sales and service labor.