(a) Except for good cause shown, every order requiring payment of maintenance under this article shall require that the maintenance be paid through the central unit for collection and disbursement of support payments designated pursuant to Kan. Stat. Ann. § 39-7,135, and amendments thereto. A written agreement between the parties to make direct maintenance payments to the obligee and not pay through the central unit shall constitute good cause.

(b) If child support and maintenance payments are both made to an obligee by the same obligor, and if the court has made a determination concerning the manner of payment of child support, then maintenance payments shall be paid in the same manner.