What is OTP Authentication?

OTP authentication is the practice of confirming a user's identity by sending a one-time passcode (OTP) that they enter to prove they control a phone number or account. Over WhatsApp, OTPs are delivered using authentication-category templates, often with a one-tap copy button for the code.

Businesses use WhatsApp OTPs for account logins, password resets, payment confirmations, and securing sensitive actions. WhatsApp delivery is attractive because it is reliable, fast, encrypted, and in many markets more cost-effective than SMS OTP.

Implementing OTP over WhatsApp can reduce delivery failures and improve completion of verification steps compared with SMS.

How it works with Defuser AI

Defuser AI supports authentication-type messages for OTP delivery alongside utility, marketing, and service messaging on your WhatsApp Business API.