Okla. Stat. tit. 62 § 34.60
The State Treasurer shall prescribe the forms and manner of issuance of vouchers against agency clearing accounts and agency special accounts in the State Treasury. All vouchers drawn against agency clearing accounts and agency special accounts shall be signed by an authorized person designated by the administrative authority of the agency and countersigned by the principal fiscal officer of the agency or another person specifically designated by the administrative authority. Provided, the State Treasurer may waive the counter signature requirement if an agency certifies that controls are in place and will be followed to prevent the unauthorized issuance of its vouchers and if the vouchers are generated and signed by automated processes. Unless such waiver is granted, no voucher shall be paid by the State Treasurer without such signature and countersignature, if required.
Okla. Stat. tit. 62, § 34.60