How I built a scalable e-commerce engine with eBay and Amazon affiliate integration, real-time inventory syncing, and automated commission tracking for UK and international markets.
The client needed a robust e-commerce platform that could seamlessly integrate products from eBay and Amazon affiliate programs while maintaining real-time inventory synchronization. As an affiliate member of both platforms, the client required a system that could automatically track when customers clicked through from the website to make purchases, ensuring accurate commission attribution. The platform needed to handle thousands of products, sync inventory across multiple marketplaces, process secure global payments, and provide detailed analytics for affiliate commission tracking. Without proper tracking, the client was losing potential commissions and had no visibility into which products were driving sales.
I engineered a full-stack MERN e-commerce platform with deep integration to eBay and Amazon affiliate APIs. The system automatically syncs product inventory in real-time, tracks user clicks and redirects to affiliate platforms, and provides comprehensive commission analytics. When customers browse products on the website and click through to purchase on eBay or Amazon, the system automatically attaches affiliate tracking parameters, ensuring the client receives commission for every referred sale. The platform includes a sophisticated inventory management system that syncs product availability, pricing, and details across platforms, preventing overselling and ensuring accurate product information.
The architecture features a React.js frontend with Redux for state management, providing a seamless shopping experience with real-time product updates. The Node.js/Express backend integrates with eBay Finding API and Amazon Product Advertising API to fetch product data and manage affiliate links. A PostgreSQL database stores product catalogs, user sessions, and affiliate tracking data. The system includes a Redis cache layer for fast product lookups and session management. Stripe integration handles secure payment processing for direct purchases, while affiliate link generation ensures proper commission tracking. A background job system continuously syncs inventory data from both platforms, updating product availability and pricing in real-time. The platform tracks user sessions and click-through events, storing affiliate referral data for commission reporting.
Maintaining real-time inventory synchronization across eBay and Amazon while handling API rate limits and ensuring data consistency.
I implemented a sophisticated caching strategy with Redis that stores product data locally while periodically syncing with affiliate APIs. The system uses exponential backoff for API rate limiting and processes inventory updates in batches during off-peak hours. I created a conflict resolution mechanism that prioritizes the most recent data and flags discrepancies for manual review, ensuring 99.9% inventory accuracy.
Tracking affiliate commissions accurately when users navigate from the website to eBay or Amazon, especially with session timeouts and cookie expiration.
I developed a comprehensive tracking system that stores user sessions in the database with unique identifiers. When a user clicks an affiliate link, the system generates a tracking token that persists across sessions. The platform uses first-party cookies and server-side session tracking to maintain attribution even if third-party cookies are blocked. I implemented a 30-day attribution window that tracks conversions even if users don't purchase immediately, ensuring maximum commission capture.
Handling thousands of products from multiple sources while maintaining fast page load times and optimal user experience.
I architected a multi-layered caching system using Redis for hot product data and PostgreSQL for persistent storage. The frontend implements lazy loading and pagination, while the backend uses database indexing and query optimization. I implemented a CDN for static assets and product images, reducing load times by 70%. The system pre-fetches popular products and uses predictive caching based on user behavior patterns.
Ensuring secure payment processing and compliance with international payment regulations for UK, European, and global customers.
I integrated Stripe's payment platform with support for multiple currencies and payment methods. The system includes PCI-DSS compliant payment handling, 3D Secure authentication for European customers, and automatic tax calculation based on customer location. I implemented fraud detection rules and transaction monitoring to prevent fraudulent purchases while maintaining a smooth checkout experience for legitimate customers.