Disqus uses OAuth v2 for Authentication.
Register a new application at the Disqus API, and
fill Client Id and Client Secret values in the settings:
SOCIAL_AUTH_DISQUS_KEY = ''
SOCIAL_AUTH_DISQUS_SECRET = ''
extra scopes can be defined by using:
SOCIAL_AUTH_DISQUS_AUTH_EXTRA_ARGUMENTS = {'scope': 'likes comments relationships'}
Check Disqus Auth API for details.