Sandbox
If you're still struggling to make a request or parse a response, then checkout the Naurt Sandbox.
By pasting in your API key, you'll be able to forward search using addresses or, reverse search by clicking on the map with the results both plotted and displayed as a JSON.
Postman
Naurt has a public Postman collection for the final-destination endpoint. You can follow along with the documentation while make the requests in your browser. All you need is a free API key from the Naurt dashboard.