Thanks, that definitely helped! I believe it had something to do with testing on a non-standard port. I was using port 5000 for testing, so my webhook URL had that included. It did not seem to want to send any calls over http on a non-standard port. Not sure if this was an issue with our server or something the plugin might be doing.
I tested it using webhook.site (great resource, btw, thanks for sharing that), and it worked fine. After re-creating the exact message received at webhook.site in Postman and hitting my local server, it was reading the message fine, but I still wasn’t getting any hits from the server. When I removed the port and used 80, everything was fine.
Thanks for your help and for the plugin, of course! Cheers!