Share 'methods of paying'

I am currently working with my city's commissioner in how we can use DG as a tool to revitalize our city's parks; and the person I'm working with would like to know of all the many different ways DG courses receive money, or in other words, pay to play?    Besides the ol' method of a park employee sitting in a booth at the entrance charging disc golfers as they come in, what are some of the other…