This is a true beta; while our team has done an awesome job on the underlying infrastructure, queuing and payload delivery pieces (we should write a blog post about that at some point), we're taking a conservative approach to creating webhooks, and a big part of our prioritization is how people actually want to use them.
To this end, if you'd love to be in on the beta and help us shape the priorities for webhook notifications, please register your interest and describe the sorts of things you'd love to do at
https://goo.gl/forms/i8qvcLdKEGg4j2rt1.
Thanks!
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Geoff McQueen
Founder & CEO

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