23 Pa.C.S. § 8413: Contest of registration or enforcement.

(a) Defenses.--A party contesting the validity of a registered order or seeking to vacate the registration has the burden of proving one of the following defenses:

(1) The issuing tribunal lacked personal jurisdiction over the contesting party.

(2) The order was obtained by fraud.

(3) The order has been vacated, suspended or modified by a later order.

(4) The issuing tribunal has stayed the order pending appeal.

(5) Full payment has been made and there is no continuing support obligation.

(b) Relief.--If a party presents evidence establishing a full or partial defense under subsection (a), a tribunal may stay enforcement of the registered order, continue the proceeding to permit production of additional relevant evidence and issue other appropriate orders. An uncontested portion of the registered order may be enforced by all remedies available.

(c) Affirmance.--If the contesting party does not establish a defense under subsection (a) to the validity of the order, the registering tribunal shall issue an order confirming the order.