Paytm is basically is an e-wallet. In which you can transfer money to others or to the bank, you can pay your bills , recharge your numbers, book a ticket for trains, airways, movies with some discounts & Now they also add buying stuff from there online stores .
If you are first time user then you will get many discounts but after 1 week using it you won't get any discounts. One problem is if you want send money to the bank then paytm take 4 % of charges which is very high.
In using this app it feels safe and sequre to me. Speed of transaction is also good withen few seconds transaction happens.
You can use this app because there are many products in marcket which gives you paytm money after buying them , eg. Snakers, monaco, etc.
But while using any promocode read all terms and conditions carefully otherwise you won't get any kind of cashback which they offered to you.
Terms like cashback only upto 50 rs, or cashback on only if rechrge 100rs or more.
Read carefully , easy to use , time saving.