Rasa chatbot for Facebook

I have got ready rasa chatbot
When I deploy chatbot into the facebook , I have some problem

message1 = {
"attachment": {
"type": "template",
"payload": {
"template_type": "button",
"text": "click below to open Multi-page",
"buttons": [
{
"type":"web_url",
"url":"https://d691-5-61-61-227.ngrok.io/start/{})".format(tracker.get_slot("userid")),
"title": province,
"messenger_extensions": "true",
"webview_height_ratio": "tall"
}
]
}
}
}
# send payload to Facebook Messenger
dispatcher.utter_custom_json(message1)
I want to use the webview when I click the button

I used the Django to build the template
If you finished it within 6 hours, we can together in the future
I have 40 flowcharts and it menas that I need 40 chatbot
who can do it?
only bid if you are chatbot expert
write "I am expert with rasa" on the top of the bid