UPI Transaction Simulator (PhonePe Mini Clone)

A Flask-based UPI payment simulation system that mimics core digital payment features.

Features

• User Registration & Authentication
• Secure Password Hashing
• Money Transfer via UPI ID
• Balance Checking
• Transaction History
• MySQL Database Integration

Setup Instructions

1. Clone Repository

   git clone <your-repo-url>
   cd upi_transaction_simulator

2. Install Dependencies

   pip install -r requirements.txt

3. Setup MySQL Database

   • Create database: CREATE DATABASE upi_db;
   • Run the SQL commands provided in the code comments

4. Configure Environment

   • Copy .env.example to .env
   • Update database credentials

5. Run Application

   python app.py

API Endpoints

Authentication

• POST /api/auth/register - User registration
• POST /api/auth/login - User login

Wallet Operations

• GET /api/wallet/balance/<upi_id> - Check balance
• POST /api/wallet/transfer - Transfer money
• GET /api/wallet/history/<upi_id> - Transaction history

Technology Stack

• Backend: Flask (Python)
• Database: MySQL
• Password Security: flask-bcrypt
• Environment Management: python-dotenv

Project Structure

upi_transaction_simulator/
├── app.py              # Main Flask application
├── db.py               # Database connection
├── models/
│   ├── user.py         # User model
│   └── transaction.py  # Transaction model
├── routes/
│   ├── auth.py         # Authentication routes
│   └── transaction.py  # Transaction routes
├── utils/
│   └── helpers.py      # Utility functions
├── .env                # Environment variables
├── requirements.txt    # Dependencies
└── README.md          # Documentation

Testing with Postman

Import the sample API calls provided in the code comments to test all endpoints.

Future Enhancements

• JWT Authentication
• Rate Limiting
• Transaction Status Updates
• Payment Gateway Integration
• Frontend UI """