Solar Cashless Water ATM Machine

I want to develop a Water ATM that is fully powered by a standalone solar system, so there is no reliance on the grid. The unit must dispense clean drinking water on demand and accept only cash-free payments (UPI, NFC card, QR, or any similar solution you are comfortable integrating)... (Budget: ₹500000 - ₹1000000 INR, Jobs: Control Systems Engineering (PID / MPC), Electrical Engineering, Electronics, Embedded Systems, Microcontroller, PCB Layout, PLC, Solar)