How to Build Passwordless Auth With Twilio Verify in PHP
Blog post from Twilio
Passwordless authentication replaces traditional passwords with alternatives such as SMS one-time passwords, passkeys, voice, email, or silent network authentication, aiming to reduce password-related risks and simplify sign-in. The tutorial demonstrates building a PHP 8.5 application with the Slim framework, Twig templates, sessions, and Twilio Verify, requiring a Twilio account, SMS-capable phone, and environment variables for the Twilio Account SID, Auth Token, and Verify Service SID. The application uses four routes: GET and POST endpoints at the root path to display a phone-number form and request an SMS OTP, plus GET and POST `/verify` endpoints to collect and validate the received six-digit code. It stores the submitted phone number temporarily in the session, uses Twilio’s PHP SDK to create SMS verifications and verification checks, redirects users when required data is absent, clears the stored phone number after checking the code, and displays a success or failure status. After downloading styling assets and starting the local server with Composer, users can test the complete flow by submitting a phone number, receiving an SMS code, and entering it for verification.
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