75 Pa.C.S. § 6306
(c) Parking violations in first class cities.— The costs normally imposed for a summary parking violation of this title or of a parking ordinance shall be waived in the following situations:
(2) When the defendant, who has not been previously issued a parking ticket for the alleged parking violation, has been issued a citation and he remits the fine within eight days of the citation's issuance.
If the fine is remitted by mail, then a remittance postmarked within the eight-day period shall be considered as meeting the requirements of this subsection. The provisions of this subsection shall only be applicable to summary parking violations occurring in cities of the first class.
(Apr. 28, 1978, P.L.202, No.53, eff. 1 year; Feb. 15, 1980, P.L.12, No.8, eff. 60 days)