Callback Notifications

Hello i have registered callback url with this code and it's registered successfully i in response json on callbackurl i have get the {} dict when package is created. is there sometinh missing??? url = "%s/callback" % self.API_ENDPOINT data = { "url":"%s/esign_silanis/silanis_callback" % my_url "key":"", "events":["PACKAGE_CREATE","PACKAGE_DECLINE","PACKAGE_COMPLETE"] }; try: resp = requests.post(url, headers=self.header, data=json.dumps(data)) except Exception: _logger.exception('An error has occurred while trying to connect to e-SignLive service') raise ValidationError(_('An error has occurred while trying to connect to e-SignLive service')) Thanks