Payment Integration Feature Build

I’m working on a project-based system and now need a standalone engagement to add a fully functional payment integration. The sole objective is to build this new feature from end to end, wire it into the existing codebase, and verify that transactions flow securely and reliably in both sandbox and live modes. You’ll receive access to the current repository along with API keys for the gateway we finally settle on—Stripe, PayPal, Razorpay or whichever option proves the best fit once you assess the stack. I’ll count on you to: • hook the checkout flow into our back-end logic, • handle tokenisation and PCI-compliant storage rules, • surface clear success / failure messaging on the front end, and • document the setup so future devs can replicate it quickly. Success is confirmed when I can run a test payment, see it appear in the provider’s dashboard, and have the application reflect the correct order status automatically.