Loyalty members can earn points based on their number of visits.
The number of visits records earch unique session sold within an order. It's only valid for Box Office sales, because it's dependant on session data.
For example: If a customer buys 2 tickets and one is for session A and the other for session B, then this is 2 visits. If the customer then uses their member card within a second order and buys another ticket for session A, that will become visit 3.
Orders with only concessions aren't registered as visits.