ISO 22000:2018 sets out the requirements for a food safety management system and can be certified to. It maps out what an organization needs to do to demonstrate its ability to control food safety hazards in order to ensure that food is safe. It can be used by any organization regardless of its size or position in the food chain.
A food license by which is issued by the FSSAI is regarded as a permit which is required to operate a food-related business and also in order to ensure good quality of food in your business and for the benefits one from government actions on non-compliances.
Udyog Aadhaar is highly advisable for Sole Proprietors who dont have an official govt recognition as udyog aadhaar helps a sole proprietor get a unique identity and official registration.