Paytm.com is the application used for online recharge for all vendors and also for online shopping.However I have not done any online shopping.: -) . Its great to know that the founder is from India. I am using this app from the year 2011. I use it for my all type of recharges. It is a very use friendly app.
Advantages:
Fast recharge.
Pick phone number from your mobile contact list.
All type of recharge available without additional charge.
Save your cards.
Fast refund if your order is cancelled during recharge.
Cash back offers( Occasionally)
Disadvantages:
New updates is slowing down the app process.
App is compatible for mobile, in desktop app is not working properly we need to refresh again and again.
In my view, I have seen this till date.