How to Build Passwordless Auth Using TOTP With Twilio Verify in .NET
Blog post from Twilio
A Twilio tutorial explains how to create a .NET 9 Razor web application that provides passwordless authentication through time-based one-time passwords (TOTP) and Twilio Verify. The application follows a three-stage process: users submit a username, enroll an authenticator app by scanning a generated QR code or entering a secret seed and confirming an initial six-digit code, and subsequently validate new TOTP codes for authentication. It uses Twilio Verify Factors to associate a generated identity with a TOTP factor, QRCoder to produce the enrollment QR code, DotNetEnv to load Twilio credentials and Verify Service configuration from a .env file, and server sessions to retain factor details during the demo. The guide supplies Razor pages and C# handlers for registration, factor verification, and later challenge validation, then describes testing locally with an authenticator application such as Authy or Google Authenticator. It presents TOTP-based passwordless authentication as a way to reduce password-related risks and login friction while relying on mobile authenticator apps and Twilio’s verification infrastructure.
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