WhatsApp, arguably the most used mobile messaging application isn’t available for iPad as it lacks the SMS or calling feature required for WhatsApp verification. But this hasn’t stopped modders from installing WhatsApp on iOS with full features.
As of later versions of WhatsApp needs Jailbreak tweaks to function, so this trick requires your iPad’s iOS to be jailbroken. This method has been tested to work with jailbroken iOS 8.1.2 and should probably work on later iOS versions.
Jailbreaking void’s the warranty of your device & I hold no responsibility for your jailbroken device or related activity.