How to add Twitter Direct Messages into Twilio Flex

To integrate Twitter Direct Messages into Twilio Flex, developers need to set up a Twilio account and create a Flex project. They then need to create a Twitter app and request access to the Account Activity API. A custom application needs to be built that listens for updates from both sides (customer and agent) and forwards messages accordingly. This involves creating a channel for the customer, sending messages to Flex via this channel, and responding to Twitter's challenge-response checks. The sequence diagram demonstrates the flow of messages back and forth. Once the endpoint is up and running, developers can complete steps 3 and 4 of Twitter's Getting Started with Webhooks guide to register their application and subscribe their Twitter account to updates. Interactive chat features like Quick Replies and Buttons can be added to enhance the user experience. The code for this proof of concept, including interactive Buttons, is available in a repository.