Their is only one API that the OpsAnalitica platform uses. If you want to see how we interact with the API and the order in which we make calls and what data we feed into our calls.
The best way to do that is to get your Favorite Browser, I like Google Chrome, and follow these steps:
Open Up the Developer Tools
Go to the Network Tab
Navigate to the part of the platform that you are trying to figure out.
Edit or Create an Entity.
Then you can look at the Developer tools to see what End points we are calling and what data is being passed.
If you mimic what we do in your scripts then you should be just fine.