Legal analysis: Three small workshops, small restaurants and food vendors apply for business licenses in different ways according to different regional regulations. For example, Shandong province requires three small enterprises to engage in production, processing and sales activities according to law as long as they register in accordance with regulations and obtain registration certificates.

Legal basis: Regulations of Shandong Province on the Administration of Small Food Workshops and Food Vendors

Article 26 The food and drug supervision and administration department of the county (city, district) people's government shall examine the application materials and conduct on-site inspection when necessary. To meet the conditions, the "small catering registration certificate" will be issued within fifteen working days, and the registration information will be notified to the local township people's government or street offices; If it does not meet the requirements, it shall not be registered and the reasons shall be explained in writing.

Small catering registration certificate is valid for three years. If it is necessary to extend the validity period, it shall apply to the registration authority for an extension 30 days before the expiration of the validity period.

If the contents of small catering registration change, it shall apply to the original registration authority for change, and the registration authority shall complete it within ten working days.

Twenty-seventh small catering registration certificate shall specify the name of the small catering, the name of the operator, the registration certificate number, business address, business scope and other contents.