Common: Message Protocol

{
  "project_id": "pid",
  "data": {
    "event": "update",
    "model": "User",
    "version": 1.23,
    "attributes": [
      {
        "id": "1",
        "name": "user1",
        "email": "[email protected]"
      },
      {
        "id": "2",
        "name": "user2",
        "email": "[email protected]"
      }
    ]
  }
}