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"
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