{

"$schema": "http://json-schema.org/draft-07/schema",
"definitions": {
  "channel_id": {
    "type": "string"
  },
  "user_id": {
    "type": "string"
  },
  "group_open": {
    "type": "object",
    "description": "learn more: https://api.slack.com/events/group_open",
    "properties": {
      "channel": {
        "$ref": "#/definitions/channel_id"
      },
      "type": {
        "const": "group_open"
      },
      "user": {
        "$ref": "#/definitions/user_id"
      }
    },
    "example": {
      "channel": "G024BE91L",
      "type": "group_open",
      "user": "U024BE7LH"
    }
  }
}

}