"altText": "This is a buttons template",
"thumbnailImageUrl": "https://example.com/bot/images/image.jpg",
"imageAspectRatio": "rectangle",
"imageBackgroundColor": "#FFFFFF",
"uri": "http://example.com/page/123"
"data": "action=buy&itemid=123"
"data": "action=add&itemid=123"
"uri": "http://example.com/page/123"