I really appreciate the work I hear being done for Webhooks V.2!
My organization’s meetings often operate on a drop-in basis, as participants may join at any time. It will be very helpful them to know the current number of attendees when they are considering joining.
Therefore, a very valuable additional feature for my app for Webhooks V.2 would be a parameter of current number of attendees, with notifications sent out real-time upon attendee number changes.