{
  "destination": "Uab012345678901234567890123456789",
  "events": [
    {
      "replyToken": "nHuyWiB7yP5Zw52FIkcQobQuGDXCTA",
      "type": "message",
      "timestamp": 1462629479859,
      "mode": "active",
      "source": {
        "type": "user",
        "userId": "u206d25c2ea6bd87c17655609a1c37cb8"
      },
      "message": {
        "id": "325708",
        "type": "image",
        "contentProvider": {
          "type": "external",
          "originalContentUrl": "https://example.com/original.jpg",
          "previewImageUrl": "https://example.com/preview.jpg"
        }
      }
    }
  ]
}