Omnibasis app is using all of Omnibasis API.
Just navigate into your application on Omnibasis and open Chrome developer tools.
The best way to find a proper APIs to call is to use Chrome developer tool and watch XHR network calls.
Learn more at https://developers.google.com/web/tools/chrome-devtools/network-performance/
Watch tutorial at https://www.youtube.com/watch?v=nl8iKlo2NeM