From techcrunch.com
WhatsApp users updating to the latest version of the messaging app on iOS will find a new setting lurking at the bottom of the ‘Privacy’ menu that adds support for Apple’s biometric authentication technologies.
WhatsApp users on iOS can now tap into Apple’s biometrics for an extra layer of security
Under the new setting, called ‘Screen Lock’, users of WhatsApp on iOS can tap through to another menu to add an additional layer of security by requiring either their facial biometric or a fingerprint to unlock the messaging app.