Chatfuel Post back

[
    {
      "attachment": {
        "payload":{
          "template_type": "button",
          "text": "test JSON with postback",
          "buttons": [
            {
              "url": "http://pastebin.com/raw/bYwUN7un",
              "type":"json_plugin_url",
              "title":"go"
            }
          ]
        },
        "type": "template"
      }
    }
  ]