pay and display 
noun [mass noun, usually as modifier]
A parking system in which a motorist buys a temporary permit from a coin-operated machine and displays it in the window of the vehicle: a pay-and-display car park...
- Bath is planning a pilot scheme where 10,000 motorists will use electronic tags to replace parking permits and potentially pay-and-display tickets as well.
- Until now, there has been a policy of clamping at pay-and-display car parks when a vehicle is left more than an hour beyond the time a ticket expires.
- The car park will operate a pay-on-exit system as opposed to other pay-and-display car parks in the area.