China UPI Gaming Payment Gateway

I need help integrating a China-based payment gateway into my gaming platform so players can pay for in-game purchases with UPI. The flow is straightforward: during checkout the player chooses UPI, completes the transaction, and is then returned to a dedicated payment-success page that shows a receipt. You’ll be responsible for selecting or configuring a Chinese gateway that actually supports UPI, wiring up the API calls, handling all callbacks, verifying signatures, and making sure the purchase is unlocked only after a confirmed payment. Please include sandbox testing, production hand-off, and concise documentation so my team can maintain the integration later. Deliverables • Fully working UPI payment module integrated in our game • Automatic redirect to a payment-success page that displays the receipt data we receive from the gateway • Clear setup notes, API keys placeholders, and rollback instructions I’m ready to get started as soon as you can share an outline of your approach and an estimated timeline.