How to Implement WhatsApp OTP Verification in Brazil: A Practical Guide

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Developers building login, registration, or checkout flows in Brazil can use WhatsApp's official Business Platform to send one-time password (OTP) codes for phone verification. WhatsApp outperforms SMS and email in Brazil, offering roughly 98% read rates at around R$0.03 per message compared to R$0.08–0.15 for SMS. The core implementation involves two steps: sending a code via a POST request and verifying the user-entered code against the returned OTP identifier. Providers such as Twilio Verify, Zenvia, Infobip, and the Brazilian-focused entrar.api.br offer ready-made APIs compatible with Node.js, PHP, and Python. Developers are advised to use only the official WhatsApp Business Platform, as unofficial web automation risks account blocking by Meta.

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