There is no out of the box or built in Indian payment gateway. With enough money, I'm sure someone with the skillset would be willing to develop it. I'm guessing most users here don't need it so that is why there is little discussion here.
Maybe it'd be easier to post a requirement for this on some consulting boards to see if anyone is willing to develop one for you for a fee.
AbanteCart is open source so I think it helps for people using this program to understand that unlike canned package software which you buy off the shelf, it takes a little work to get it working the way you want. Maybe it's just me, but some of the recent posters don't seem to understand that basic concept and to do a lot of your own research first.
Good luck in your search to fund a PayUMoney extension.