Upon filing with the Secretary of State of the articles of incorporation and the certificate provided for in Section 7084, the incorporation of the reinsurer shall be complete and it may engage in business as such reinsurer upon applying for and obtaining from the commissioner a certificate of authority. The term and nature of such certificate of authority, annual renewal fee therefor, the due date and delinquent date of such fee shall be the same as provided by Article 3, Chapter 1, Part 2, Division 1, of this code for stock and mutual insurers governed by said article. No county mutual fire reinsurer shall transact business in this State without a valid and subsisting certificate of authority as provided for herein; provided, however, that any such reinsurer presently authorized to conduct such business shall not be required to pay the first ten dollars ($10) annual certificate of authority fee until April 1, 1964.