If the director approves the application, he or she shall notify the alien bank of his or her approval and shall file certified copies of its charter, certificate or other authorization to do business with the secretary of state. Upon such filing, the director shall issue a certificate of authority stating that the alien bank is authorized to conduct business through a branch or agency in this state at the place designated in accordance with this chapter. Each such certificate shall be conspicuously displayed at all times in the place of business specified therein.

The office of the alien bank must commence business within six months after the issuance of the director's certificate: PROVIDED, That the director for good cause shown may extend such period for an additional time not to exceed three months.