My SaaS platform needs a seamless One payments gateway integration that can confidently process one-time transactions from start to finish. The core codebase is already live; what’s missing is the secure checkout, server-side verification, and user-friendly payment flow anchored on One payments’ API. Here’s what I expect as the end result: • A fully working client- and server-side integration using the latest One payments SDK or REST API, wired into our existing authentication and order logic • Webhook/instant payment notification handling so successful payments instantly update our database and trigger confirmation emails • Tokenised card handling and PCI-compliant practices where applicable • End-to-end testing in both sandbox and production modes, followed by concise setup documentation so my internal team can maintain it You’ll have direct access to our staging environment, Postman collections for current endpoints, and an architectural overview to speed things up. Clean, well-commented code in the same stack we already use (Node.js & React) is essential, alongside clear commit history in Git. If you’ve previously integrated One payments—or similar gateways—into a SaaS product focused on single-purchase flows, I’d love to see a brief example or repo snippet.