{
  "services": {
    "send_message": {
      "name": "Send message",
      "description": "Sends message to target room(s).",
      "fields": {
        "message": {
          "name": "Message",
          "description": "The message to be sent."
        },
        "target": {
          "name": "Target",
          "description": "A list of room(s) to send the message to."
        },
        "data": {
          "name": "Data",
          "description": "Extended information of notification. Supports list of images. Supports message format. Optional."
        }
      }
    }
  }
}