Vending machine Control System (QR Code)

I already have the full mechanical side of a new, cost-effective outdoor vending machine—frame, actuators, motors, sensors, the lot. What’s missing is the electronic heart: a sleek touchscreen interface, a reliable controller, and rock-solid QR-code payment processing... (Budget: ₹1500 - ₹12500 INR, Jobs: Arduino, Electronics, Embedded Systems, Firmware Development, Microcontroller, Raspberry Pi, Software Architecture, UI / User Interface)