Hi,
So here the documentation refers to the documentation for the particular scripting language you are using for external authentication.
If you unzip our app, you find a folder called ServerIntegration that has the lccs libraries required for setting up the external authentication from different scripts such as coldfusion, python, ruby, php and so on. Each of these script folder has respective script contents along with README files on how to setup things and so on.
Also, you will find examples on using our server to server APIs( external authentication being a Server2Server communication) with these different scripts under sampleApps/Server2Server/ folder. These examples also have README files for setup.
The answer to your question are all these README files.
Hope this helps
Thanks
Hironmay Basu