Hello Stuart developer’s team,
I saw on your documentation that you are using Oauth2 for authentication purposes.
How does it works exactly?
and how will I be able to authenticate my app to interact with your API?
Best,
Hello Mathieu 
Yes you are right, all Stuart API endpoints support OAuth 2.0 authentication protocol.
To have a general understanding of what OAuth 2.0 protocol is, we recommend you to have a look at these well written articles:
Notice that we use the client credentials grant type to provide your application a way to access its own service account via API.
In addition we provide client libraries in different languages that manage your authentication for you entirely.
For example, you can have a look at the ruby client library and see how the authenticator class is working.
Hello Paul,
Thanks for your answer, I will have a look at your recommended articles and will come back to you if needed during my tests.
You’re welcome,
Feel free to search for answers and ask in Q&A section if you have any question.
Best Regards,