{
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    "direction": "ltr",
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          "text": "Header",
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      "url": "https://1417094351.rsc.cdn77.org/articles/1439/1438984/thumbnail/small.gif?3",
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      "aspectRatio": "1.51:1",
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        {
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    "footer": {
      "type": "box",
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      "contents": [
        {
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          "action": {
            "type": "uri",
            "label": "Button",
            "uri": "https://linecorp.com"
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        }
      ]
    }
  }
}