Building a Two-Factor Authentication system using Bandwidth’s BXML

The text discusses the use of Bandwidth's BXML (Bandwidth XML) in building a two-factor authentication system. It explains that BXML is an alternative to Bandwidth’s Voice API for handling phone call operations during active calls, and provides documentation links for further information. The text then outlines how 2FA works for registration and login systems with phone calls using BXML. Sample code snippets are provided for a simple login system implementation using BXML. It also highlights the importance of securing BXML routes to prevent unauthorized access.