Now on the latest version 7.6.1 of freecharge application we can directly recharge friends or family member by whatsApp .
First enable whatsApp by setting.
Then type amount that you want to recharge before FC..
Means if 100 Rs. Recharge type 100FC .then we can see freecharge f click on it by this way we can send money or recharge that whats App number without opening freecharge app.
Other Best thing in new freecharge app is we can directly login by mobile number.
Now no need to remember email ids .