{
  "systemId": "e9af05b4-70de-4920-880f-026c6fb67d1b",
  "userId" : 1234567890
  "endpointUri": "http://cloud.notify.windows.com/.../",
  "platform": "Windows",
  "platformVersion": "1.0",
  "deviceName": "Test Endpoint",
  "locale": "en-US",
  "titleId": 1297290219
}