![]() ![]() If you’re familiar with the Verify API for sending SMS OTPs, it’s literally just a one-word change to the API request to switch the desired Channel parameter from SMS to WhatsApp. We actually saw this first hand with Authy where the SMS conversion rate experienced a big drop in a country due to toll fraud for a week, but the WhatsApp conversion rate didn’t change. ![]() Lastly, WhatsApp is a modern, IP-based network that isn’t exposed to fraud that exploits the telecom network, such as toll fraud, also known as traffic pumping. WhatsApp also doesn’t charge for messages that aren’t delivered. Adding WhatsApp also resulted in a higher overall conversion rate, because it works on WiFi when there is no cell connection to receive SMS. Adoption was particularly strong in heavy WA countries like Brazil, India, Indonesia, and Germany where we saw 20-40% of users pick the WA option. ![]() When we added WhatsApp as another channel to send OTPs in our Authy app's sign-up/login flow, we saw strong user adoption: sending about 2000 WA messages per day globally. What did you learn from adding WhatsApp to your Authy app? Every WhatsApp user is identified by a unique phone number that they provided when creating their WhatsApp account, so this means that WhatsApp can directly replace SMS for all verification use cases, including sign-up, login, and transaction. With over 2 billion users across 180 countries, it is fast achieving ubiquity. Over the last few years, we’ve witnessed the rise of a new messaging channel: WhatsApp. Why is WhatsApp a good channel for OTP delivery?
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