When you use WhatsApp to send OTP authentication messages, you’re boosting security for both you and your customers because WhatsApp messages are end-to-end encrypted.

Plus, having an OTP code delivered right in a WhatsApp chat adds a layer of security because of WhatsApp’s own measures to ensure that the rightful account owner can access their messages.

Read More : https://sinch.com/blog/send-whatsapp-otp/