I promised WhatsApp to provide the security feature of biometric users of Android after that provided by iOS users. Now, after having undergone this water for a short period of tests, they are now available for all users of Android.
Lets you the latest version of WhatsApp, lock your records and chats and the app itself using your fingerprint registered. You can do this by going to Settings then to the Account, and go then to Privacy then to the Fingerprint Lock after updating the app to the latest version of course.
There is also an additional option for the interim, which is convenient to some extent because you probably don’t want to open your conversations every time you use the app.