Okla. Stat. tit. 68, § 1354.17

For the purposes of representing this state on the governing board authorized by the Streamlined Sales and Use Tax Agreement, there shall be four representatives as authorized by this section. The state shall be represented by one member of the State Senate appointed by the President Pro Tempore of the Senate, one member of the Oklahoma House of Representatives appointed by the Speaker of the Oklahoma House of Representatives, one state employee employed in the area of taxation or finance appointed by the Governor and one member or employee of the Oklahoma Tax Commission appointed by the Tax Commission.