code: def validate_ssl_certificate(self, client):
          
          response = client.request('GET', 'https://api.twilio.com:8443')
  
          if response.status_code < 200 or response.status_code >= 300:
              raise TwilioRestException(response.status_code, 'https://api.twilio.com:8443', 'Failed to validate SSL certificate')
docs: Validate that a request to the new SSL certificate is successful
          :return: null on success, raise TwilioRestException if the request fails