Okla. Stat. tit. 47, § 566

The Oklahoma New Motor Vehicle Commission may deny any application for license or registration, or suspend or revoke a license or registration issued or impose a fine, only after a hearing of which the applicant, registrant, or licensee affected, shall be given at least ten (10) days’ written notice specifying the reason for denying the applicant a license or registration, or, in the case of a revocation or suspension or imposition of a fine, the offenses of which the licensee or registrant is charged. The notices may be served as provided by law for the service of notices, or mailing a copy by certified mail to the last-known residence or business address of the applicant, registrant, or licensee. The hearing on the charges shall be at such time and place as the Commission may prescribe and the aforementioned notice shall further specify the time and place. If the applicant, registrant, or licensee is a salesperson, or factory, or distributor representative, the Commission shall in like manner also notify the person, firm, association, corporation, or trust with whom he or she is associated, or in whose association he or she is about to enter. The Commission shall have the power to compel the production of all records, papers, and other documents which may be deemed relevant to the proceeding bearing upon the complaints. The Commission shall have the power to subpoena and bring before it any person, or take testimony of any such person by deposition, with the same fees and mileage and in the same manner as prescribed in proceedings before courts of the state in civil cases. Any party to the hearing shall have the right to the attendance of witnesses on his or her behalf upon designating to the Commission the person or persons sought to be subpoenaed.