As a web developer I used payumoney for payment gateway of online sopping website. I often make payment on bookmyshow and myntra with Payumoney.
For customers:
Payumoney is quick and easy in use. Not taking too much time in loading. but not good for slow network.
They give Cashback and many discount coupons, so nice money savings.
Great safety and security. With using payumoney your ll details and money is safe.
For Merchants:
If you want to start your online shop the big hurdle is payment gateway, there is no any reliable and cheap option for local e-commerce platform before Payumoney. But payumoney is great solution. Its Free payment gateway.
they give very deep information so easy to integrate. and also fast in registration. there customer support is easily reachable by email or even phone and they answer very responsibly.
You can trust on payumoney for payment to payment gateway both.