Collaborate API requires Authentication to access the API endpoints. HighQ has adopted OAuth2 as its authentication standard. 

This section explains how to authenticate with Collaborate API's and addresses authentication related issues. 
 

API Access Mechanism using OAuth2

Managing token expiration

How are permissions determined for the API calls

OAuth for desktop Applications (Automating OAuth)

What to use for redirect_uri parameter

Adding a new API application registration

OAuth2 Libraries