code: def update_billing_info(self, billing_info):
          
          url = urljoin(self._url, '/billing_info')
          response = billing_info.http_request(url, 'PUT', billing_info,
              {'Content-Type': 'application/xml; charset=utf-8'})
          if response.status == 200:
              pass
          elif response.status == 201:
              billing_info._url = response.getheader('Location')
          else:
              billing_info.raise_http_error(response)
  
          response_xml = response.read()
          logging.getLogger('recurly.http.response').debug(response_xml)
          billing_info.update_from_element(ElementTree.fromstring(response_xml))
docs: Change this account's billing information to the given `BillingInfo`.