February 16, 2026 · 9 min read
Stop paying per OTP — how we built WhatsApp-based 2FA for Keycloak 26.x
A practical guide to securing apps with WhatsApp 2FA and centralized SSO. Eliminate per-message SMS OTP costs by sending verification codes through an app your users already have open.
This article was published on Medium.
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https://remotiq-au.medium.com/stop-paying-per-otp-how-we-built-whatsapp-based-two-factor-authentication-for-keycloak-26-x-3ce3af59ec9c