You can do this in Mendix by adding a "publish rest document". GET is typically not used for sending data to a service in a body though, would expect POST or PUT.
For more info:
* https://www.mendix.com/blog/publishing-rest-apis-in-mendix/
* https://docs.mendix.com/refguide/published-rest-services/
Easiest for https testing is probably to use something like ngrok to forward messages to your dev machine.
Hi Everyone,
For anyone who has been looking at the same challenge as me here, the links postedby Andrej are invaluable and well worth a look for the key info. I also came across a blog post by Ryan Mocke here : How to make a Slack Bot with Mendix which steps you through the entire process and got me right where I needed to be!
Hope this helps!