Hi @wtfstoops69,
my extension uses the SharePoint Rest v1 API.
So to use it you will have to create an client token in your sharepoint. (I think you need to have at least admin access to the sharepoint site to do that)
Here is a small tutorial how to create/connect using the rest api in general
Basically my extension just sends the correct post/get request needed - you can just send the requests with the basic post/get/http retriever node instead if you are familiar with http requests.
If there are any question regarding my nodes or how to connect to the sharepoint rest api in general - then feel free to ask 
In this thread there is also a bit of information regarding the sharepoint list: