Как я могу создать шаблон списка в Facebook Messenger из Dialogflow

Question

Я пытаюсь закодировать шаблон списка в Facebook Messenger в Dialogflow, но он не работает.

      {

  "facebook": {

   "payload": {
        "template_type": "list",
        "top_element_style": "compact",
        "elements": [
          {
            "title": "Classic T-Shirt Collection",
            "subtitle": "See all our colors",
            "image_url": "https://originalcoastclothing.com/img/collection.png",          
            "buttons": [
              {
                "title": "View",
                "type": "web_url",
                "url": "https://originalcoastclothing.com/collection",
                "messenger_extensions": true,
                "webview_height_ratio": "tall",
                "fallback_url": "https://originalcoastclothing.com/"            
              }
            ]
          },
          {
            "title": "Classic White T-Shirt",
            "subtitle": "See all our colors",
            "default_action": {
              "type": "web_url",
              "url": "https://originalcoastclothing.com/view?item=100",
              "messenger_extensions": false,
              "webview_height_ratio": "tall"
            }
          },
          {
            "title": "Classic Blue T-Shirt",
            "image_url": "https://originalcoastclothing.com/img/blue-t-shirt.png",
            "subtitle": "100% Cotton, 200% Comfortable",
            "default_action": {
              "type": "web_url",
              "url": "https://originalcoastclothing.com/view?item=101",
              "messenger_extensions": true,
              "webview_height_ratio": "tall",
              "fallback_url": "https://originalcoastclothing.com/"
            },
            "buttons": [
              {
                "title": "Shop Now",
                "type": "web_url",
                "url": "https://originalcoastclothing.com/shop?item=101",
                "messenger_extensions": true,
                "webview_height_ratio": "tall",
                "fallback_url": "https://originalcoastclothing.com/"            
              }
            ]        
          }
        ],
         "buttons": [
          {
            "title": "View More",
            "type": "postback",
            "payload": "payload"            
          }
        ]  
      }
      }
}