How to Build Passwordless Auth Using TOTP With Twilio Verify in Go
Blog post from Twilio
The tutorial explains how to create a Go web application that implements passwordless authentication with time-based one-time passwords (TOTP) through Twilio Verify. It describes a three-stage flow in which a user submits a username, scans a generated QR code or manually enters a secret into an authenticator app such as Authy or Google Authenticator to verify a new TOTP Factor, and later submits fresh six-digit codes to authenticate. The guide covers setting up a Go project, installing session, QR-code, environment-variable, and Twilio SDK dependencies, configuring Twilio account credentials and a Verify Service SID, and creating routes and HTML templates for registration, factor verification, and ongoing token validation. The application stores Factor details and the generated identity seed in HTTP sessions, uses Twilio Verify to create and update TOTP Factors and challenges, and displays success or failure messages after code checks. It presents passwordless TOTP authentication as a way to reduce password-related risks and login friction while noting that secure random generation should use crypto/rand rather than math/rand for cryptographic values.
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