docs: def get_next_appointment(self, appointment_group_ids=None):
          """
          Get next appointment.
  
          Return the next appointment available to sign up for. The appointment
          is returned in a one-element array. If no future appointments are
          available, an empty array is returned.
          """
          path = {}
          data = {}
          params = {}
  
          # OPTIONAL - appointment_group_ids
          """List of ids of appointment groups to search."""
          if appointment_group_ids is not None:
              params["appointment_group_ids"] = appointment_group_ids
  
          self.logger.debug("GET /api/v1/appointment_groups/next_appointment with query params: {params} and form data: {data}".format(params=params, data=data, **path))
          return self.generic_request("GET", "/api/v1/appointment_groups/next_appointment".format(**path), data=data, params=params, all_pages=True)