(a) For the purpose of this Code section, the term "processes of law" means any notice, demand, proposed assessment, final assessment, direction, ruling, or order issued by the commissioner or other official of the department as provided by law in the administration of the tax laws of this state. When service in the hands of the Secretary of State or other action is required of the Secretary of State, it shall be sufficient compliance with this Code section if the service or other action is done by a deputy of the Secretary of State. When action is required of the commissioner, it shall be sufficient compliance with this Code section if the action is done by his deputy or attorney.

(b)(1) The fact of engaging in some act or activity within this state giving rise to a tax liability or obligation under this article shall constitute an appointment by the person engaging in the act or activity of the Secretary of State or his successor in office to be the true and lawful attorney in fact of the person upon whom may be served, while the act or activity is being engaged in or for as long as the statute of limitations prescribed for the tax liability or obligation remains open, any processes of law for the determination and enforcement of the tax liability or obligation and shall signify the agreement of the person engaging in the act or activity that any process of law served upon the Secretary of State shall be of the same legal force and validity as if served upon the person personally.

(2) For the purposes of this subsection, a person engages in some act or activity within this state giving rise to a tax liability or obligation when the person:

(A)(i) Performs or carries on any employment, trade, business, profession, or any other act or activity for financial gain or profit within this state including, but not limited to, the rental of real or personal property located within this state or for use within this state and the sale, exchange, or other disposition of tangible or intangible property having a situs in this state;

(ii) By reason of any act or activity performed or carried on within this state comes within the definition of "dealer" as defined in Code Section 48-8-2; or

(iii) Otherwise operates personally or through partners, employees, agents, or otherwise in this state so as to incur any liability or obligation with respect to the payment or collection of taxes imposed by this article; and

(B)(i) Does not maintain a residence, known place of business, or known agent to receive service of process; or

(ii) If he has maintained in this state a known place of residence, place of business, or agent, the known place of residence, business, or agent has been discontinued.

(c) Venue in any action or proceeding in which the Secretary of State by reason of subsection (b) of this Code section is made an attorney in fact for service of process shall be in Fulton County. The service in such a case shall be perfected by leaving a copy of the process in the hands of the Secretary of State and by sending by registered or certified mail or statutory overnight delivery a copy of the process to the person if his address is known and by attaching to the original process an affidavit of compliance with this Code section. When it appears from the affidavit that a copy of process has been mailed by the commissioner to a known address, a second mailing shall not be required of the Secretary of State to the same address, but the Secretary of State shall keep the copy received by him on file as a source of information for any inquiry from the person for whom the Secretary of State is attorney in fact, concerning the person's tax liabilities and obligations incident to the person's taxable acts or activities within this state.