I've found Postman to be the most useful tool for exploring the API. cURL is still problematic -- I've followed carefully a couple tutorials with no success and I can't figure out why. A simple python script using the request library works well but isn't quite the explore and debug tool that Postman is.
Next up is hook up some sensor to an MCU, send data to a Raspberry Pi running Node-Red, then have N-R use the API to update my Mastodon status. Day job+holidays likely push that out to the new year.