Build a Facebook Messenger Bot with Dialogflow (API Tutorial)

This tutorial guides users through building a Facebook Messenger bot on their Facebook page using Google Dialogflow and the Vonage Messages API. The chatbot app takes inbound messages via the 'Send Message' button on a Facebook page or via the Facebook Messenger app, routes them to Google Dialogflow for natural language processing, and sends responses back to Facebook Messenger via the Vonage Messages API. The tutorial covers setting up a skeleton application, creating a Messages application in the Vonage API, connecting the Vonage Messages API to Facebook, sending messages from Facebook to Dialogflow, sending replies from Dialogflow to Facebook, and testing the bot. The prebuilt Small Talk agent is used for testing purposes, but users can build their own agents with more knowledge or worth to share with the user.