Legal background
Resolution No. 20/1993. (24. V.) of the General Assembly of the Municipality of Debrecen Town of County Rank on the use of pay parking lots
You can read the regulation here.
Bulletin no. 2009/2. of the Municipality of Debrecen Town of County Rank (the amendment of the Decree on the Regulation of Pay Parking Lots, p. 88.)
You can read the Bulletin here (PDF).
Governmental Decree on Parking Cards for People with Reduced mobility
The decree is available here.