I'm currently working on integrating GotoWebinar API into a system and I find it very strange that there does not seem to be a webhook event for when a registrant unregisters from a webinar. All I could find wre these events "registrant.added, registrant.joined, webinar.created, webinar.changed" which are completely useless in the context of a full integration. Having an event like "registrant.left" or "registrant.canceled" would be very basic and essential. As of right now if a user registers to an event and then cancels it from the email, I have no way to track that event and update my database accordingly. Do your fkn job Gotowebinar, add some proper events, it's not that fkn hard since you've come a long way. I'm super frustrated as it makes my integration look like a half-assed job.