{
  "event": "message.waiting",
  "data": {
    "id": "<string>",
    "event": "message.waiting",
    "metadata": [
      {}
    ],
    "me": {
      "id": "<string>",
      "pushName": "<string>"
    },
    "payload": {
      "id": "<string>",
      "from": "<string>",
      "to": "<string>",
      "participant": "<string>",
      "fromMe": true,
      "ack": 123,
      "ackName": "<string>"
    },
    "instanceId": "<string>",
    "userId": "<string>"
  }
}