WhatsApp update allows users to lock it behind Face ID or Touch ID
The folks over at WhatsApp have decided to add an extra layer of security for those using the app and allow them to lock the app behind Face ID or Touch ID. To benefit from the new security feature, simply head to Settings / Account / Privacy and make sure to enable Screen Lock.
Once Screen Lock is enabled, every time you open WhatsApp, the app will require Face ID or Touch ID to unlock, otherwise, you won't be able to use. Of course, if you're using WhatsApp quite often, the additional security protection added in the latest update may be bothersome, but better safe than sorry.
There's one more thing you should know: even when Screen Lock is enabled, you will still be able to view WhatsApp notifications if the preview feature is on. Also, you can still use the quick reply within iOS without having to use Face ID or Touch ID when Screen Lock is enabled.