The clerk of the superior court shall be authorized to assess a four percent fee against each child support payment processed by the clerk, PROVIDED That said fee shall not be assessed more often than one time per month per cause wherein child support payments have been ordered paid and PROVIDED, FURTHER, That the maximum assessment so payable in any one month for any one such cause shall not exceed $15.00. (Added by Ord. 82-019, Mar. 10, 1982; Amended by Ord. 81-060 § 1, July 22, 1981).