Its now official you can now Send and Receive payments via Whatsapp, here is a complete guide to How to Set Up Whatsapp payment Account, Send & Receive Payments
How To Get WhatsApp UPI Option
How To Send Money Using Whatsapp UPI
How To Recieve MoneyUsing Whatsapp
Currently there is no launch offer like Google Tez Or PhonePe app, but stay tuned we will keep you posted.