Very effective XeroChat add-on that enhances messenger bot features. This add-on includes : JSON API connector & webview form builder .
 

JSON API Connector:

JSON API connector sends JSON data to any of your provided external URL. Once any specific event mentioned below is triggered, system will send json data to your provided webhook URL & it will wait for 10 second to get response. If system does not get response in 10 seconds, it will send another post request to your webhook. You can then process your data as you want. This feature can be used to connect our system with any third party app like Zapier or your own custom app.

Demo: https://xeroneit.net/portfolio/messenger-bot-connectivity-xerochat-add-on

Download:

messenger_bot_connectivity.zip

it's v2.5.7

Version 3.3 please