code: def auth(self, request):
          
          callback_url = self.callback_url(request)
  
          request_token = Pocket.get_request_token(consumer_key=self.consumer_key, redirect_uri=callback_url)
          # Save the request token information for later
          request.session['request_token'] = request_token
          # URL to redirect user to, to authorize your app
          auth_url = Pocket.get_auth_url(code=request_token, redirect_uri=callback_url)
  
          return auth_url
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