How to Build Passwordless Auth Using TOTP With Twilio Verify in Python

This tutorial explains how to build a Python-based passwordless authentication demo using FastAPI, Twilio Verify, and time-based one-time passwords generated by authenticator apps such as Authy or Google Authenticator. It describes a three-stage flow in which a user enters a username, receives a Twilio Verify TOTP Factor represented by a QR code and setup secret, confirms the factor with an initial six-digit code, and subsequently validates new codes during login. The application uses environment variables for Twilio credentials, session cookies to retain Factor details, Jinja2 templates for forms, QR-code generation for authenticator enrollment, and Twilio’s Verify API to create factors, verify enrollment, and approve later authentication challenges. The tutorial positions TOTP passwordless authentication as a way to reduce password-related security risks and user friction while noting that it adds implementation complexity.

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