There are many legitimate and paying sites that you Paytm now. I have been looking at traffic exchanges sites recently to write up reviews about the site. Most all of these sites have an affiliate program that you can join. When you join this program the payment is through Paytm. I also know of many sites from India that use this payment system.
Furthermore, many sites that offer surveys and paid to click wall can no longer use PayPal as a form of payment. Therefore, they've had to look into other options for payment and one of them is Paytm. A good place to find out the payment methods and how the company sends payment is through review sites.
I do reviews of paid working opportunities online and I will let the person know all about the site. How it works, how to earn, what you need to be paid, and how the company pays you. Many review sites, such as the one I run will do the same for people. It is easy to do a search online and just type in the name of the site and review at the end. This will display all the reviews about the site and you can find out so much information without a lot of work.