{
  "onChat": {
    "required string content": 1,
    "required string from_id": 2,
    "required string to_id": 3,
    "required string time": 4
  },

  "onTransfer": {
    "required string content": 1,
    "required string from_id": 2,
    "required string to_id": 3,
    "required string time": 4
  },

  "onLeave": {
    "required string user": 1
  },

  "onAdd": {
    "required string user": 1
  }
}