Okla. Stat. tit. 28, § 56

When a marriage is to be performed by any judge, the court clerk of the county where the marriage is performed shall collect a fee of Ten Dollars ($10.00), in addition to the fee provided for in Section 31 of this title for every marriage ceremony so performed, which fee shall be deposited in the court fund. No judge shall perform a marriage ceremony without proof of the payment of this fee.