Hello.. These days I have seen that online shopping sites offer good discount for using credit card. I wonder what is the reason behind it. Honestly even I was having credit card I have never used it as I have heard lots of negative thing about it that later on I may have to pay lots of charges. Not sure if it is true. But what can be the reason behind this discount for using credit card on shopping sites. Is there something hidden? I mean what if I have to pay heavy interest by using credit card.