In my opinion I think Paytm is a very good app for purposes like paying fee, paying bill, for booking traveling tickets, for any banking transactions, for shopping also. Even You can book your seat in theatre for movie by buying theatre ticket from this website.
All the transactions are safe on this website. But there is a lack of one thing in it which is its customer service otherwise it is a very good app it provides unbelievable cashback for example now it is giving 100% cashback due to diwali festival which is amazing , you have to pay shipping charge only for this product.
It is also good because if you pay your electricity bill ( more than ₹500 ) it provides you some exciting offers like to getting a chance to win gold etc. by using promocodes provided by PAYTM or if you dont want that chance then enter another promocode which will recharge your paytm wallet by ₹50 on every bill pay which is not bad.
I also use this app for shopping only because of its cashback offers.
I love this app.
So, Paytm Karo.