D.C. Mun. Regs. tit. 27, § 5043
5043.1 Requests for payment must be submitted in writing by the contractor together with a valid written contract.
5043.2 Contractor payment requests shall:
(a) Certify that the contractor is entitled to payment in the requested amount; and
(b) Include or attach any information necessary to demonstrate entitlement to the requested payment under the contract's terms.
5043.3 Depending on the contract's payment provisions, a payment request may consist of, for example, a statement that specified work has been completed in a satisfactory manner, documentation showing that contract deliverables have been accepted by the OAG, or information detailing the reimbursable costs incurred by the contractor.
5043.4 Payment shall not be made unless authorized by the Contracting Officer. A Contracting Officer's payment authorization shall not preclude the OAG from seeking repayment (or pursuing other remedies) if it subsequently concludes that the contractor was overpaid or otherwise misled the OAG.
5043.5 In addition to the Contracting Officer's payment authorization, all payment requests must be certified and approved by the District's Chief Financial Officer (or his or her designee) prior to making any payment.
5043.6 No OAG employee shall authorize payment for the value of supplies and services received without a valid written contract. Any vendor who enters into an oral agreement with an OAG employee to provide supplies or services to the OAG without a valid written contract shall not be paid. This subsection shall not apply to a payment required by court order, a final decision District of Columbia Contract Appeals Board.
SOURCE: Final Rulemaking published at 65 DCR 4406 (April 20, 2018).