It is very good app in my opinion because you can do all your payment by sitting at home in a few seconds. You can pay:
1) Your DTH bill payment
2) Mobile bill payment or recharge your balance.
3) Electricity bill
4) You can also book your air tickets, bus, movies ticket and hotel room or etc.
And you also buy many thing from paytm like TV, books, mobiles and etc.
It is the way to transfer money and for bill payment. It is the best app for payment. So paytm Karo.