Okla. Stat. tit. 59, § 1938

The State Board of Behavioral Health Licensure shall have the power to issue a license by endorsement for an applicant licensed in another state to practice as a behavioral practitioner or under similar title if the Board deems such applicant to have qualifications comparable to those required under the Licensed Behavioral Practitioner Act and if the Board finds the applicant meets the standards, provided by rule, for license by endorsement.