As a host, you can ring customers up and "put it on their tab" so to speak.
This only works with classes, meaning that if you have a cart with just a class in it, you'll see an option to Pay Later.
If you have other items in the cart (like a package or a product), this Pay Later option will disappear.
How do I collect payment later on?
If you're ringing up a customer that owes for classes, you'll see an 'Unpaid Class' option. Select this to add the unpaid classes to the cart.
Is there a setting to charge customers automatically for what they owe?
Yes, under Settings > General Setup > scroll to Unpaid Class Bookings Auto-settlement and choose when they'll get charged.