For new development, we encourage you to use the Verify API instead of the Authy API. The Verify API is an evolution of the Authy API with continued support for SMS, voice, and email one-time passcodes, an improved developer experience and new features including:

Twilio helper libraries in JavaScript, Java, C#, Python, Ruby, and PHP

Access via the Twilio CLI

Push authentication SDK embeddable in your own application

This blog post uses the Authy API. The Authy API will continue to be maintained, but any new features and development will be on the Verify API. Check out the FAQ for more information and Verify API Reference to get started.