I’ve already built the core vending-machine electronics on an ESP32 and now want to complete the payment side so customers can pay seamlessly via UPI. My own familiarity with UPI integration is intermediate, so I’m looking for someone who can take me from concept to a working, testable flow using a PhonePe Business account. Here’s the flow I must see working end-to-end: when a customer selects an item the ESP32 requests a transaction, a dynamic UPI QR is generated and shown on the attached display, the system listens for payment confirmation in real time, and once success is received the product instantly dispenses and the display updates. To keep things measurable, I’ll consider the job done when the following are delivered and demonstrably working on my hardware: • Clean, well-commented ESP32 firmware (Arduino, ESP-IDF, or MicroPython—your call) that requests a payment, generates the dynamic QR, polls/webhooks the PhonePe API for status, and toggles GPIO to release the product. • Simple test dashboard or serial output proving payment states (pending, success, failure) update live. • Any auxiliary server or cloud script required, with setup instructions. • Brief wiring diagram and README so I can replicate the demo on another board. I’d like to wrap this up within a month, and I’m available for quick hardware tests or clarifications as we go.