code: def download(self, days=60):
          
          days_ago = datetime.datetime.now() - datetime.timedelta(days=days)
          as_of = time.strftime("%Y%m%d", days_ago.timetuple())
          query = self._download_query(as_of=as_of)
          response = self.institution.client().post(query)
          return StringIO(response)
docs: Downloaded OFX response for the given time range
  
          :param days: Number of days to look back at
          :type days: integer
          :rtype: :py:class:`StringIO`