I have been using Paytm for quite a while now.
Product availability - All branded products and a wide category of products are available on paytm. From clothing to jewellery to electronics and everything.
Bill payment - It also enables users to pay their bills online.
Cashback - Paytm offers attractive cashback which can be used on next purchase and that is why it is so desirable to shop from paytm. I recently booked a holiday from paytm with my friends and got a good amount of cashback.
Interface - The interface of the site is very easy to understand and operate.
Security - Paytm is a very secure site. I have been using it to pay my bills and shop also and havent found any loophole in their security.
It is the best shopping destination.