It think they went bust so the links are broken, which is a shame as they were a very useful part of the Talend Community, the content linked to is still available at:
You first need to get the oAuth2 token from the given url in your documentation.
Next is using the returned token and provide it in the header while doing a api call, like search.
add the header: "Authorization" and its value is "Bearer yourtokenformpreviousRestcomponentCall"
Watch the recorded webinar!
Create systems and workflow to manage clean data ingestion and data transformation.
Introduction to Talend Open Studio for Data Integration.
Test drive Talend's enterprise products.