UPI QR Code Generator API

A lightweight API for generating UPI QR codes and rendering a secure payment page. This project is built using Go and the Gorilla Mux router.

Example of payment page

Features

• Generate QR codes for UPI payments.
• Serve a customizable payment page with UPI details.
• Easy-to-use RESTful endpoints.
• Static assets support for additional resources.

Requirements

• Go - https://golang.org
• Modules:
  • github.com/skip2/go-qrcode

Installation

1. Clone this repository:

   git clone https://github.com/AshokShau/upi-qr-generator.git
   cd upi-qr-generator

2. Install dependencies:

   go mod download

3. Run the application:

   go run main.go

4. The server will start at http://localhost:3000.

Project Structure

upi-qr-generator/
├── api/            // API endpoint handlers for vercel
│   ├── index.go    // Handles /
│   ├── pay.go      // Handles /pay
│   ├── qr.go       // Handles /qr
├── str/            // String constants and HTML templates
│   ├── files.go    // HTML templates for payment page
│   ├── handlers.go // Handlers for API endpoints
├── main.go         // Main entry point of application
├── README.md       // Project README file
└── LICENSE         // Project license file

API Endpoints

1. GET /

Redirects to the homepage (static/index.html) that provides usage information.

2. GET /qr

Generates a UPI QR code based on the provided query parameters:

• Parameters:

  • vpa (string, required): UPI ID (e.g., example@upi).
  • name (string, optional): Payee name (e.g., John Doe).
  • amount (float, required): Payment amount (e.g., 100.50).

• Example:

  /qr?vpa=example@upi&name=John+Doe&amount=100.50
  

• Response: A PNG image of the QR code.

3. GET /pay

Renders a payment page with UPI details:

• Parameters:

  • vpa (string, required): UPI ID (e.g., example@upi).
  • name (string, optional): Payee name (e.g., John Doe).
  • amount (float, required): Payment amount (e.g., 100.50).

• Example:

  /pay?vpa=example@upi&name=John+Doe&amount=100.50
  

• Response: A rendered HTML page with the QR code and payment details.

How It Works

1. The /qr endpoint generates a UPI QR code using the qrcode library.
2. The /pay endpoint serves a payment page with details dynamically rendered from the template.html file.
3. Static assets such as styles and templates are served from the static folder.

License

This project is licensed under the MIT License. See the LICENSE file for details.

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Author

Ashok Shau

Feel free to explore, use, or contribute to this project. If you encounter any issues or have suggestions, open a GitHub issue or create a pull request!