rocket-developer-123/virtual-upi ? reverse-engineered prompt

Build me a polished mobile first demo app called RPAY, a completely virtual UPI style sandbox where people can send and receive fake currency called Kinex, not real money.

I want users to be able to sign in with a handle like name@rpay, get a starting balance bonus, search a global directory, send money to other users, scan a QR code or payment link to start a checkout, and show their own receive QR code. Add a passbook style transaction history with incoming payments in green and outgoing payments in red, plus a way to hide or reveal the balance with an eye icon.

The app should use custom four digit PIN screens for login and payment approval, and the flow should feel smooth and secure. Include an admin account called Boss0 with controls to broadcast warnings, adjust balances, freeze accounts, and remove users for demo purposes. Make it look like a modern fintech app with a clean dark theme and glowing neon coin styling. If you need current browser or QR library details, look them up online first.