如何使用Microsoft Bot Framework和Facebook Messenger发送富文本卡？

我正在使用Facebook Messenger Platform和Microsoft Bot Framework来创建一个发送富文本附件的机器人 .

到目前为止，我已尝试在我的intent文件中使用通用模板：

messageData = {
                "attachment": {
                    "type": "template",
                    "payload": {
                        "template_type": "generic",
                        "elements": [{
                            "title": "First card",
                            "subtitle": "Element #1 of an hscroll",
                            "image_url":     "http://messengerdemo.parseapp.com/img/rift.png",
                            "buttons": [{
                                "type": "web_url",
                                "url": "https://www.messenger.com",
                                "title": "web url"
                            }, {
                                "type": "postback",
                                "title": "Postback",
                                "payload": "Payload for first element in a generic bubble",
                            }],
                        }, {
                            "title": "Second card",
                            "subtitle": "Element #2 of an hscroll",  
                            "buttons": [{
                                "type": "postback",
                                "title": "Postback",
                            }],
                        }]
                    }
                }
            }
            return resolve([toCard(messageData)])
        }
    })
})
}


const toText = message => {return {type: 'text', content: message }}
const toCard = message => {return {type: 'attachment', content: message}}

我的index.js中也有一个sendMessageByType函数，该函数应根据从各种意图收到的响应类型发送消息 .

const sendMessageByType = {
     text: (session, elem) => session.send(elem.content),
     attachment: (session, elem) => session.send(elem.content)
 }

上面的函数调用如下所示：

.then(res => { res.forEach( (message) => sendMessageByType[message.type](session, message)) })

我已经尝试将类型更改为文本，卡片和附件，但这些都不起作用 . 什么是正确的类型以及如何声明它以便发送卡？