ESP32 PhonePe UPI Verification

@technologiesit

Building on my robust 10+ years of experience as a Full Stack Developer, I am confident in bringing your ESP32 PhonePe UPI verification module to life. Being adept in both the Arduino framework and ESP-IDF, I assure you that the firmware and full API integration steps you seek, will be delivered with utmost precision. My familiarity with Payment Gateway Integration and PHP will come exceedingly handy when managing the QR scanning process, callback handling, parsing responses from PhonePe's API, and verifying checksum or signature requirements if any. Having successfully delivered over 100 projects throughout my career, I not only write code but build solutions that bring real results. Reliability and scalability are deeply ingrained in my work ethos which aligns well with your requirements for reliable transaction/success status within a strict 5-second timeline and NO false positives. I am a developer who believes in long-term support and fast delivery along with clear communication at every stage of the project. With me on your team, turning your vision into a functioning reality isn't a hope—it's an assurance. So let's collaborate now for an impeccable ESP32 + PhonePe UPI verification system!

@shadabkhan92

Having worked extensively in the IoT and embedded systems field, with a focus on Arduino and ESP32 programming, I am confident in my ability to deliver the solution you need for your UPI verification project. With a deep understanding of QR code generation, APIs, and payment gateways, I can ensure that your ESP32 module communicates successfully with the PhonePe app and provides accurate transaction confirmations within seconds. Furthermore, my experience in software development across multiple platforms - including mobile app development - will be advantageous as we navigate any complications that may arise during the integration process. This flexibility combined with my experience in PHP will also be useful as we tackle any necessary checksum or signature verifications PhonePe may demand. Lastly, my focus extends beyond simply developing the firmware you seek. I strive to empower clients like you to replicate and expand the solutions I provide. As such, I will provide you with a comprehensive setup guide covering PhonePe merchant account registration, API credentials setup, as well as webhook configuration. In conclusion, my expertise in Arduino and ESP-IDF frameworks; my track record building intricate systems that combine sophisticated AI with edge hardware; plus my commitment to equipping you not just with a solution but with all the knowledge needed for replication separate me as the best candidate for this project.

@NEHABHAT92

With nearly a decade’s worth of experience in web and mobile app development, I am confident in my ability to meet and exceed your project requirements. My proficiency in Android, Mobile App Development, and PHP will prove invaluable as we integrate the PhonePe UPI payment system into your ESP32 module. I specialize in E-commerce and CMS based websites, meaning I understand the need for flawless transaction verification that your project demands. In terms of UPI and PhonePe integrations on embedded hardware, I have had prior experience that aligns perfectly with your project’s needs. My team is adept at working with the Arduino framework as well as the ESP-IDF, ensuring maximum flexibility while developing firmware for your hardware. Additionally, we have built and maintained API integrations in many of our projects, handling everything from generating or displaying QR codes to verifying checksums and signatures. I assure you a high-quality codebase that leaves no room for false positives. One key quality that sets me apart is my focus on maintaining clear communication channels throughout the project. I will not just provide you with a functioning solution but also a setup guide that details the whole process from registration to webhook configuration should you need to reproduce it on additional devices. With my broad skillset, commitment to timelines, and dedication to absolute client satisfaction, I am confident that your project is in good hands with me!

@sjohn117

Hi Client, I’m Sean, an Embedded Systems Engineer with 8 years of experience specializing in Embedded C, ESP32 firmware, and Payment API integration. I built an ESP32-based UPI verifier used in a pilot retail kiosk project that reliably validated live PhonePe transactions and exposed status via MQTT and GPIO. I will implement a robust QR-generation and verification pipeline: generate/display UPI QR, securely register device credentials with PhonePe, and verify callbacks or perform authenticated polling with checksum/signature validation. I can do this project perfectly and will prioritize deterministic verification logic and retry/idempotency to eliminate false positives. I typically deliver this scope in 14 days, including tests, instrumentation logs, and deployment-ready Arduino/ESP-IDF firmware. All code will include unit/integration tests, logging/monitoring hooks, OWASP-aligned API handling, clean code, and documentation; I will include notes on evals/guardrails and data-privacy handling for callbacks. Please confirm preferred framework (Arduino or ESP-IDF) and test PhonePe sandbox access so I can begin Do you have PhonePe sandbox/merchant credentials already, and which firmware framework do you prefer: Arduino or ESP-IDF? Best regards, Sean

@somendersingh96

Hello, This is a precision-critical embedded + payment verification system, and I can build a reliable ESP32-based solution to validate UPI transactions (PhonePe, GPay, BharatPe) with near real-time confirmation. ✅ Approach • Use dynamic/static UPI QR generation (as per merchant setup) displayed on TFT • Implement backend-assisted verification (recommended for reliability) • Configure webhook listener (server) to receive payment confirmation from PhonePe • ESP32 polls or subscribes (MQTT/WebSocket) to get instant status updates • Parse response and trigger local output (GPIO / Serial / MQTT) ✅ System Flow QR displayed on ESP32 User pays via UPI app Payment gateway sends webhook to backend Backend verifies signature/checksum ESP32 receives status (within ~2–5 seconds) ✅ Deliverables • Fully commented ESP32 firmware (Arduino/ESP-IDF) • Lightweight backend (Node.js/Python) for webhook + verification • UPI integration guide (PhonePe merchant setup, API keys, checksum) • Demo logs/video showing real payment detection ✅ Output Options • GPIO trigger (HIGH/LOW) • Serial logs (amount + txn ID) • MQTT publish (for system integration) I have experience with IoT + API integrations + real-time systems, and will ensure zero false positives with secure verification logic. Ready to start and discuss your preferred output method. Best regards, Somender Singh

@soniaer987

Hello, I can develop your ESP-based PhonePe UPI verification system with reliable payment detection and real-time response. Experience & Skills: Strong experience in ESP32/Arduino, embedded systems, API integration, and IoT-based payment workflows. I have worked on similar embedded + UPI/payment integration projects before, including real-time transaction handling and device control. Relevant Project: Developed a Smart Security System with RFID and IoT integration, involving real-time data processing, device communication, and automation logic. Approach: I will implement secure PhonePe API integration, generate/verify UPI transactions, and ensure real-time status detection on the ESP device with stable firmware. Similar systems use QR-based UPI flow with real-time confirmation and device action on success. I have worked on similar projects before and understand end-to-end payment flow and verification logic. If hardware involvement is required, I have components in stock, can test in my lab, and will ship the final working setup after completion. Timeline: I can complete this within 2 days. Looking forward to working with you.

@Anika1802

Being an experienced developer with a broad scope of digital expertise –including several projects related to API integrations– I am confident I have the technical prowess and knack for problem-solving that your project demands. The ESP32-WROOM, TFT screens, and utilizing Nudging & Zapier in business automation are some of the areas where we have a clear overlap. Additionally, I bring an all-around proficiency with various tools, including REST APIs and Payment Gateways that will be hugely advantageous for this project. My ability to understand complex ideas quickly and deliver efficient results is exactly what has won the trust of the 80+ businesses I've collaborated with over the past four years. What sets me apart is my commitment to go beyond mere completion of a project; my victory lies in the tangible growth my work brings about for clients' businesses. This aligns perfectly with your need for a reliable ESP32-WROOM-Centric system capable of verifying UPI transactions and instantly disseminating success/failure confirmation from a PhonePe callback.

@itzdikshantgupta

UPI verification on ESP32 isn’t about code—it’s about handling unreliable APIs safely in real-time. Most setups fail because PhonePe (and UPI in general) doesn’t support direct device callbacks the way people expect. You need a secure backend layer, or you’ll get false positives. Here’s how I’ll structure this so it actually works in production: ESP32 will handle QR display + local response A lightweight backend (Node/Python) will handle PhonePe API calls, checksum validation, and webhook listening ESP32 will poll or receive MQTT updates from backend (fast + reliable) Direct ESP32 ↔ PhonePe is not stable due to auth, SSL, and callback constraints. ✔️ Built payment verification flows with webhook + polling fallback logic ✔️ Zero false-positive architecture using server-side signature validation ✔️ Sub-5 second detection using hybrid webhook + short-interval polling ✔️ Clean ESP32 firmware (Arduino/ESP-IDF) with clear GPIO/MQTT outputs Flow: User scans QR → pays via Google Pay / PhonePe Backend receives webhook + verifies checksum ESP32 fetches status → triggers output Critical insight: relying only on polling risks race conditions and missed states. I combine webhook confirmation + polling sync to eliminate edge cases. I’ll also document: Merchant onboarding API keys + checksum logic Webhook setup + retry handling Question: Are you okay with a lightweight cloud/local server layer, or do you strictly want everything embedded on ESP32? — Dikshant

@nitishk47

Hi I checked your project details, and I can help you build exactly what you’re looking for — a fast, scalable, and clean solution. I’m a PHP developer with strong experience in Laravel, Vue.js, and MySQL, and I’ve built multiple dynamic and user-friendly web applications. I focus not just on coding, but on delivering a product that performs well and is easy to maintain. What you’ll get working with me: Clean, optimized, and scalable code Responsive and user-friendly design On-time delivery with clear communication Quick understanding of your requirements (no back-and-forth delays) I’ve worked on similar projects where I improved performance and built reliable backend systems, so I’m confident I can deliver exactly what you need. Quick question: Do you already have the design and API ready, or should I handle everything from scratch? I’m available to start immediately and would love to discuss your project in detail. Looking forward to your response. Best regards,

@Royalitservices

Hi there, You’re absolutely in the RIGHT PLACE. I’ve delivered SIMILAR PROJECTS multiple times and know EXACTLY how to execute this efficiently and correctly from day one. To lock down the SCOPE, TIMELINE, AND PRICING, I’ll need to ask you a few key questions. Unfortunately, Freelancer’s 1500 CHARACTER LIMIT doesn’t allow me to break everything down properly here. Let’s jump on CHAT so I can show you my PROVEN PAST WORK, walk you through the REAL RESULTS I’ve delivered, and outline a CLEAR ACTION PLAN for your project. You’ll immediately see why my approach is DIFFERENT and EFFECTIVE. If you’re serious about getting this done RIGHT, I’m ready to move forward. Looking forward to CONNECTING and WINNING TOGETHER. Cheers, Mayank Sahu

@Sadiyasyeda24

Hello, I understand the task and will ensure your expectations are me. I am a skilled freelancer with 4 years of experience in PHP, Software Architecture, API Integration. Visit my profile to view latest projects. Please connect in chat so we can discuss. Best regards, Syeda Tahreem

@bmsharath

I am an Embedded Systems Engineer based in Bangalore with extensive hands-on experience developing standalone modules using the ESP32-WROOM and TFT displays. Having recently built custom firmware for ESP32-based controllers and integrated real-time data processing for various IoT applications, I am well-equipped to handle the specific challenges of PhonePe API integration. My approach will focus on implementing a robust, optimized polling sequence to meet your sub-five-second detection requirement, ensuring the device remains responsive while communicating with the PhonePe Status Check API. I am highly comfortable with the security demands of payment gateways, including calculating SHA-256 X-VERIFY headers and managing Salt Keys to ensure a zero false-positive rate through strict signature verification. I will provide you with clean, fully commented Arduino or ESP-IDF source code that generates dynamic UPI deep-link QR codes and exposes success confirmations via GPIO or MQTT as requested. Along with the firmware, I will deliver a comprehensive setup guide for your PhonePe merchant credentials and provide live log captures demonstrating the handshake and transaction validation process. My background in developing AI-powered hardware and my local expertise in the Indian UPI ecosystem allow me to deliver a production-ready solution that is both reliable and secure. I am ready to start immediately and can ensure your module performs flawlessly in a live environment.

@singhs19

Hello, I can help you build a reliable, real-time UPI payment verification system using ESP32 that works seamlessly with apps like PhonePe, Google Pay, and BharatPe.

@haseebahmad222

My proficiency in Node.js and Python will be especially valuable for handling the PhonePe API integration and transaction flow you've described. I'm adept at handling real-time systems and ensuring reliable data transmission, which aligns perfectly with your need for rock-solid transaction verification and quick payment detection. Additionally, my knowledge of REST APIs enhances my capability to design and build APIs for your module to generate or display QR codes and parse response data efficiently. I understand that you value a low false-positive rate in your test environment, and that's another area where I excel: ensuring robustness in testing scenarios to eliminate potential loopholes. Alongside delivering a fully-commented source code for the ESP32, complete with setup guides on merchant account registration, API credentials, webhook config, I'll also provide log captures or a demonstration video to show live payments being detected and confirmed. This way, you can be confident in the performance of your system. Feel free to message me so we can get started on turning your idea into a reality!

@Gagan9599

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