{

"$schema": "http://json-schema.org/draft-07/schema",
"definitions": {
  "channel_id": {
    "type": "string"
  },
  "timestamp": {
    "type": "string"
  },
  "user_id": {
    "type": "string"
  },
  "message.mpim": {
    "type": "object",
    "description": "learn more: https://api.slack.com/events/message.mpim",
    "properties": {
      "channel": {
        "$ref": "#/definitions/channel_id"
      },
      "channel_type": {
        "const": "mpim"
      },
      "event_ts": {
        "$ref": "#/definitions/timestamp"
      },
      "text": {
        "type": "string"
      },
      "ts": {
        "$ref": "#/definitions/timestamp"
      },
      "type": {
        "const": "message"
      },
      "user": {
        "$ref": "#/definitions/user_id"
      }
    },
    "example": {
      "channel": "G024BE91L",
      "channel_type": "mpim",
      "event_ts": "1355517523.000005",
      "text": "Let's make a pact.",
      "ts": "1355517523.000005",
      "type": "message",
      "user": "U2147483697"
    }
  }
}

}