Could require the stub to be displayed on the dash of the vehicle parked for launching at the site.
The idea really has merit and you will always have the folks that will bilk the system, its best to let them put their own foot in a trap than to try and chase them around with it. The honest folks will remain so, as long as they know its there and has to be used.
I have a golf course down the road that has a box that you drop a $10 in and head out for a quick par 3 round of nine.
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