Okla. Stat. tit. 62, § 62-34.65: Payment of vendor invoices

A. To facilitate the payment of vendor invoices and contract

estimates, the Director of the Office of Management and Enterprise

Services shall prescribe a uniform document to be used by all

agencies of the state. The document shall provide summarized

information relative to the referenced invoices or contract

estimates, together with a space for the approval of the head of the

agency approving said vendor invoices or contract estimates for

payment.

B. Vendor invoices and contract estimates shall be accepted by

the state in lieu of the claim form previously required in the same

manner as commercial invoices are paid.

C. Vendor invoices and contract estimates shall be filed with

the agency receiving the merchandise or services in the same manner

as invoices are filed with commercial firms.

D. Upon receipt of invoices or contract estimates, the head of

the agency, or the agency's authorized agent, may approve said

documents for payment as confirmation of delivery or acceptance of

the goods or services. Whereupon, the approved invoices or contract

estimates shall be attached to the document provided for such

purpose and the head of the agency approving such invoices of

contract estimates for payment shall affix the approval in the space

provided on the document.

E. Commercial invoices shall be accepted in lieu of the

standard notarized claim prescribed by the state.