{
  "message": {
    //"token": "--TOKEN-HERE-- - set automatically",
    //"topic": "--TOPIC-HERE-- - set automatically"
    "data": {
      "event": "--",
      "event_data": "{ \"data\": \"no\" }"
    },
    "notification": {
      "title": "Flutter calling",
      "body": "Let's build it!"
    }
  }
}