Return available classes for a given month.
|the ID of the appointment type of the class offering|
|the ID of the calendar the class is offered on|
|the name of the appointment type|
|the time of the class offering|
|the name of the calendar|
|the duration of the class in minutes|
|whether or not the class is a series (a series is a class which the client should book all times offered)|
|the maximum number of attendees in the class|
|the remaining slots still available|
Use /availability/classes to display class schedules, or for creating an appointment.