'Get information about authorization ``id``.
:param int id_num: (required), unique id of the authorization
:returns: :class:`Authorization <Authorization>`'

@requires_basic_auth
def authorization(self, id_num):

    json = None
    if (int(id_num) > 0):
        url = self._build_url(u'authorizations', str(id_num))
        json = self._json(self._get(url), 200)
    return self._instance_or_null(Authorization, json)
