code: def auth(self, request):
          
          try:
              auth = self.gh.authorize(self.username,
                                       self.password,
                                       self.scope,
                                       '',
                                       '',
                                       self.consumer_key,
                                       self.consumer_secret)
              request.session['oauth_token'] = auth.token
              request.session['oauth_id'] = auth.id
          except AuthenticationFailed as e:
              messages.add_message(request, messages.ERROR, message="GITHUB RENEW FAILED : Reason {}".format(e))
              return reverse('user_services')
  
          return self.callback_url(request)
docs: let's auth the user to the Service
              :param request: request object
              :return: callback url
              :rtype: string that contains the url to redirect after auth