In this chapter, we learned a lot by building two exciting projects.

First, we built a callback request application where we made outgoing calls using the Twilio REST API and used StatusCallback to check up on the status of calls.

Secondly, we created a more advanced app: a conference calling system. Here we learned to structure our applications in a maintainable way using Laravel and worked with Twilio's conferencing functionality.

So far, we've stuck almost entirely to Twilio's PHP library. In the next chapter, we'll briefly learn how to get started, work with, and learn more about the libraries Twilio offers for other languages, such as Ruby, Java, and .NET.