If you want that customer can connect with you via WHATSAPP
customer can place order by using whats app
customer want to share product on whatsapp

then this extension is best for you.
DEMO: http://dyisol.com/oc3020/index.php?route=product/product&product_id=43

Features:
plug and play
whatsapp chat
ocmod

support and installation is free
dyisolco@gmail.com
for instant reply please contact at whatsapp link