Hi Michael,
Yes, this is doable. https://medium.com/@yashishdua/building-webhook-is-easy-using-aws-lambda-and-api-gateway-56f5e5c3a59... appears to provide a good guide on getting started with this.
Thanks. I was hoping someone in the ESRI universe had tried it already, but I'll start tinkering with it and post any relevant results.
Hi Mike, it works?
Thank you!