This is an Open Source of my personal project PayCard
A unified contactless payment system for retail stores and public transportation. "The single card for all your retail and fare payments."
Documentation • Features • Quick Start • Contributing
PayCard is a cashless payment solution designed for retail stores and transportation. Built with affordable hardware and accessible technology as a school project.
Note: This project is for educational purposes only and not intended for commercial use.
- Fast Contactless Payments - Utilizes RFID (ESP32 + RC522) for quick, tap-to-pay functionality.
- Affordable Hardware - Built using low-cost, readily available components.
- Rewards & Discount Logic - Includes a proof-of-concept for a 20% fare discounts (e.g., for PWD/Students).
- Unified System - A single card system designed to handle both retail (itemized) and transport (fare) transactions.
- Analytics Dashboard - A simple dashboard for viewing transaction history and user data.
- Card Lifecycle Management - Core functions to register, activate, load, and block RFID cards.
- Dual Payment Logic - Handles both itemized billing (for retail) and distance-based fare calculation (for transport).
- Reward Points System - A proof-of-concept for calculating 0.2% cashback points per transaction.
- Email Receipts - Automatically sends transaction details via SMTP (e.g., Gmail) after a payment.
- Web Dashboard - A simple web interface for users, merchants, and admins to review transaction logs.
- Transaction Security - Implements card-to-server authentication, balance verification, and basic audit logging.
| Component | Technology |
|---|---|
| Backend | Go 1.22+ |
| Database | MySQL 8.0+ |
| Payments | Stripe API |
| Hardware | ESP32 + RC522 RFID |
| Frontend | HTML, Tailwind CSS, JavaScript |
| SMTP (Gmail) | |
| Version Control | Git & GitHub |
A video demonstration will be available here once the project is finalized.
User taps card ➔ Validates balance ➔ Deducts payment ➔ Earns points ➔ Receipt sent
This project was made possible by the incredible work of the following communities and technologies:
- The Go Community - For a robust and efficient backend language.
- MySQL - For a reliable and powerful database solution.
- ESP & Arduino Developers - For versatile microcontroller support.
- Tailwind Labs - For a utility-first CSS framework.
- Stripe - For accessible and developer-friendly payment infrastructure.
- The entire Open Source Community - For the countless tools and libraries that power modern development.
Helping local businesses and campuses build cashless ecosystems
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