Online Payment Gateway Integration

I need a developer who can wire up a clean, secure online-payment flow for one-time transactions. The site is already live; what’s missing is the gateway layer. I would like to work with the following providers—, Cashfree, PayU, SabPaisa, Easebuzz,Paytm etc.

You’ll handle everything from obtaining the API keys, building the front-end checkout form, and scripting the server-side calls, to configuring webhooks for success / failure notifications and running test as well as live transactions. Clear, well-commented code and a brief hand-over note are all I need for sign-off.

Also needed to make some modification in website too