Okla. Stat. tit. 36, § 36-622: Manner of service of process

A. Triplicate copies of legal process against an insurer for

whom the Insurance Commissioner is agent shall be served upon the

Commissioner at the principal offices of the Insurance Department.

When legal process against an insurer for whom the Insurance

Commissioner is agent is issued, it shall be served in triplicate by

any manner now provided by law or in lieu thereof by mailing

triplicate copies of such legal process in the United States mails

with postage prepaid to the Insurance Commissioner with return

receipt requested, in which event service shall be sufficient upon

showing of proof of mailing to the Commissioner with the return

receipt attached. At the time of service the plaintiff shall pay to

the Insurance Commissioner Twenty Dollars ($20.00), taxable as costs

in the action. Upon receiving service, the Insurance Commissioner

shall promptly forward a copy thereof by mail with return receipt

requested to the person last so designated by the insurer to receive

the same.

B. Process served upon the Insurance Commissioner and copy

thereof forwarded as provided in this section shall constitute

service upon the insurer.