code: def check_authorization(self, access_token):
          
          p = self._session.params
          auth = (p.get('client_id'), p.get('client_secret'))
          if access_token and auth:
              url = self._build_url('applications', str(auth[0]), 'tokens',
                                    str(access_token))
              resp = self._get(url, auth=auth, params={
                  'client_id': None, 'client_secret': None
              })
              return self._boolean(resp, 200, 404)
          return False
docs: OAuth applications can use this method to check token validity
          without hitting normal rate limits because of failed login attempts.
          If the token is valid, it will return True, otherwise it will return
          False.
  
          :returns: bool