Name any leading Payment Processor with Web presence and I have integrated it. With an experience of over 5+ years in development and maintenance , here are a few of the listed Payment Gateways that i have successfully integrated - 1. Stripe 2. Authorize.net 3. Paypal 4. Elavon(UK) 5. Elavon(US) 6. CCavenue 7. Billdesk 8. 2Checkout 9. Braintree(Product of Paypal)