
NationBuilder
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NationBuilder supports OAuth2 as their authentication mechanism.
Follow these steps in order to use it:

* Register a new application at your Nation Admin panel (define the
  *Callback URL* to "http://example.com/complete/nationbuilder/" where
  "example.com" is your domain).

* Fill the "Client ID" and "Client Secret" values from the newly
  created application:

     SOCIAL_AUTH_NATIONBUILDER_KEY = ''
     SOCIAL_AUTH_NATIONBUILDER_SECRET = ''

* Also define your NationBuilder slug:

     SOCIAL_AUTH_NATIONBUILDER_SLUG = 'your-nationbuilder-slug'

* Enable the backend in "AUTHENTICATION_BACKENDS" setting:

     AUTHENTICATION_BACKENDS = (
         ...
         'social.backends.nationbuilder.NationBuilderOAuth2'
         ...
     )
