Guide
WhatsApp one-time passwords offer a faster, higher-trust alternative to SMS OTP. Here is how to deliver authentication codes through the Business API.
Create an Authentication-category template designed specifically for delivering verification codes.
Use the authentication template's copy-code or one-tap autofill option so users can apply the code with a single tap.
Trigger the OTP message from your app or backend when a user signs up, logs in, or completes a sensitive action.
Define how long a code is valid and limit resends to keep the flow secure against abuse.
Optionally fall back to SMS for users who cannot receive the WhatsApp message, so no one is locked out.
It depends on your country and volumes. Authentication conversations are priced per Meta's rates, which in many markets compare favorably to SMS, but you should check rates for your region.
WhatsApp offers higher open rates, end-to-end encryption, and a copy-code button, which can improve verification completion compared with SMS.
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