The cash prepayments and the bonds in the amount that may be necessary for the purpose shall be turned over and delivered to the contractor or assigns at par and accrued interest in payment of the amount due in accordance with the terms of the contract, provided that the contractor has paid to the municipal clerk all advertising, engineering, appraising, right-of-way and easements and other costs, including consulting attorneys fees and special attorney and audit fees.
Okla. Stat. tit. 11, § 37-232