mynkdev-21/upi-gateway ? reverse-engineered prompt

Build me a self hosted UPI payment gateway app for Indian merchants.

I want a clean dashboard where an admin can manage multiple merchants, each with their own API credentials and UPI payment accounts. Merchants should be able to create payment orders, generate a unique QR code or UPI payment link for each order, and track whether the payment was completed. The app should automatically verify payments when possible, with a manual UTR check as a fallback, and it should rotate between multiple UPI accounts with daily limits.

Please include signed webhook notifications for events like paid and expired, with webhook logs and retry handling. The customer flow should be simple, with a hosted payment page, QR display, and a success screen after verification. Use Blade for the interface, and make it feel polished and easy to use. If you need to, look up the current Laravel docs online and follow best practices for setup, security, and queues.