(1) It is the duty of the clerk of the court in which a criminal action has been tried, or costs accrued, to examine bills of costs. The court may also hear testimony in regard to the items, if necessary, and, if the charges are legal and duly proved, to certify the fact thereon.
(2) In making such certificate, the clerk of the court shall certify the aggregate amount of each bill of cost, writing the aggregate amount in both words and figures, and no bill of cost shall be paid unless so certified.