code: def authorization(self, id_num):
          
          json = None
          if int(id_num) > 0:
              url = self._build_url('authorizations', str(id_num))
              json = self._json(self._get(url), 200)
          return Authorization(json, self) if json else None
docs: Get information about authorization ``id``.
  
          :param int id_num: (required), unique id of the authorization
          :returns: :class:`Authorization <Authorization>`