Paytm app is very good app. This app give nice services like : -
( 1) Online Shopping
( 2) Flight tickets
( 3) Railways tickets
( 4) Mobile Recharge
( 5) Mobile bill payment
( 6) Electricity Bill payment
( 7) Water bill payment
( 8) Do payments to any shop without swap machine
( 9) DTH Recharge
You can find everythings on Paytm. So its an wonderful app