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I Built My Own "Paytm" Soundbox from Scratch! || How to Build a DIY Payment Soundbox with ESP32
This is a fully functional, DIY open-source IoT payment soundbox built to demonstrate the exact system architecture behind commercial fintech hardware (like Paytm or PhonePe speakers). In this video, I demonstrate a live UPI transaction, showcase the custom UI on the LCD display, and explain the complete system logic flow—from receiving the ...
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