(a) 2 or more persons are jointly or jointly and severally liable to pay a debt due to the Commonwealth under this Act; and
(b) one of those persons has paid the debt or part of the debt;
the person referred to in paragraph (b) may, in a court of competent
jurisdiction, recover by way of contribution, and as a debt, from any of the
other persons referred to in paragraph (a) such part of the amount paid
as the court considers just and equitable.