Transaction Processing System

This is a simple transaction processing system built with Laravel. It demonstrates handling concurrent operations, ensuring data integrity, and implementing basic security measures.

Table of Contents

• Requirements
• Installation
• Usage Instructions
• API Endpoints
• Unit Tests
• Scaling and Architecture Improvements

Requirements

• PHP 8.0 or higher
• Composer
• Laravel 11.x
• SQLite or any other supported database

Installation

1. Clone the repository with git clone https://github.com/jidejuwon/Transaction

2. Install dependencies with composer install

3. Copy .env.example file to .env cp .env.example .env

4. Generate application key with php artisan key:generate

5. Set up database connection and api token in .env DB_CONNECTION=sqlite DB_DATABASE=/path/to/database.sqlite API_TOKEN=yourapikey

6. Ensure the database file exists or create it with touch /path/to/database.sqlite

7. Run migration with php artisan migrate

8. Run seed for default user with php artisan db:seed Default user email [test@example.com]

9. Start development server with php artisan serve

Usage Instruction

1. Make Requests: Use tools like Postman or curl to test the API endpoints.
2. Import ./Transaction.postman_collection.json into postman
3. Update the Bearer Auth key with the key provided in Installation:5 (API_TOKEN)

API Endpoints

1. POST /api/transaction: Create a new transaction.
2. GET /api/balance: Retrieve the current balance for a user by sending the user's email in the request body.

Unit Test

1. Run the unit tests with php artisan test

Scaling and Architecture Improvements

To scale this system and improve its architecture for production use, consider the following strategies:

1. Database Optimization: Use indexing on frequently queried fields (like user_id in transactions). Consider database partitioning or sharding as the user base grows.

2. Caching: Implement caching for frequently accessed data, such as user balances, to reduce database load. Use Redis or Memcached for fast in-memory caching.

3. Microservices Architecture: Break down the application into microservices to handle different aspects of the transaction process, such as authentication, transaction management, and user management.

4. Load Balancing: Use load balancers to distribute incoming traffic across multiple instances of your application, ensuring high availability and reliability.

5. Monitoring and Logging: Implement monitoring tools (like New Relic or Laravel Telescope) for tracking application performance. Set up proper logging to capture errors and performance metrics for further analysis.

6. Security Enhancements: Use HTTPS for all communications to secure data in transit. Implement rate limiting to prevent abuse of the API. Regularly update dependencies to fix security vulnerabilities.