I work in Enterprise CloudOps Support and the products we support use Rest API for notifications. Frequently we get requests to help troubleshoot solutions like Pager Duty, PagerTree, ServiceNow, etc. Obviously I can't and won't signup for trials of these products, nor do I need to know them. However, I do need to know how Rest API works and how to set it up. I've been researching it and so far all I've found is this MS DevOps write-up: https://microsoft.github.io/PartsUnlimitedMRP/pandp/200.1x-PandP-LocustTest.html
However, as of yet I can't seem to make sense of some of the steps. I thought there must be a better way, so here I am. Ultimately what I'm after is a VM that I can build in a lab and use for testing Rest API calls that relay notifications, alerts, etc.