Okla. Stat. tit. 59, § 1909

The State Board of Behavioral Health Licensure shall have the power to issue a license by endorsement to an applicant licensed in another state to practice as a licensed professional counselor if the Board deems such applicant to have qualifications comparable to those required under the Licensed Professional Counselors Act and if the Board finds the applicant meets the standards, provided by rules, for license by endorsement.