WhatsApp has announced a neat new security feature that adds another layer of security to your account by requiring biometric authorization when signing into a web or desktop client. The new functionality has been rolled out to both Android and iOS users.
Before you authorize the web/desktop client session from your primary device, the app on the phone will prompt you with a biometric authentication request, face unlock included. Only after you’ve identified yourself, the QR code scanner appears on the screen.
It’s important to note that WhatsApp doesn’t have direct access to the biometric information, the app is only allowed to use it for identification.