Okla. Stat. tit. 74, § 74-500.15: Claims - Submission

All claims for reimbursement of travel expenses shall be

submitted on the regular authorized form of travel expense claim,

and shall be approved by the official or employee performing the

travel, and approved by the official or employee designated in

Section 34.68 of Title 62 of the Oklahoma Statutes, for the agency

in which the employee works. Receipts may be provided to the Office

of Management and Enterprise Services in electronic form.