Now on WhatsApp fingerprint lock feature 

..on WhatsApp beta fingerprint lock feature available on it beta version 2.19.221 it is available on it go-to setting privacy authotication new option available user's can register finger print on it on iOS it is already available it after 3 month for iOS user's for safety faceid touchid services provided available on it any new features always comes first on Android users then on iOS user's this is the first time iOS user's get new features first.