There is no complete list, although cursory Google searches will yield you with more than enough satisfactory choices to deal with. You could make a crude estimate and say that there are more than 100 payment processing options to choose from, but that wouldn't be very helpful - and it's fair to say that there are quite a few more at this point.
Really, what you'll need is the ability to discern between payment processors and payment gateways in a way that gives you an idea of which is the best. And for that, you'll need to have a strict criteria and set standard.
· Great customer service,
· An excellent track record,
· Fail-safes and wider security options.
We live in a world where cyber crimes are on a rise, and more than anything you'll want to protect your customers' money. A good payment gateway
like PayUMoney will let you do that.