You can use WhatsApp on your iPad with this app and you can also have 2 numbers of WhatsApp in your iPhone or one account on two devices, if you like..
Just like the web version of WhatsApp, the "Dual Messenger for WhatsApp WA is an extension of your phone, which simply mirror your conversations and messages as they are in your phone device, that means, all your messages remain originally saved on your phone.
To connect, open the "Dual Messenger for WhatsApp WA" and you will see a QR code, simply 'scan' this code using WhatsApp on your phone and you will be logged in. You will find this option within WhatsApp settings on your phone, at "WhatsApp Web" menu.
Your phone must be connected to the internet for the "WhatsApp Messenger is" to work, and in addition, make sure you have the latest version of WhatsApp is available for your phone.
Disclaimer
This is an UNOFFICIAL tool for WhatsApp Messenger. This app is developed by an independent developer, not affiliated to the official developer. Usage in this app falls within guidelines of "fair use".