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Frustrated, Ritendra spent his nights for six months reverse-engineering the top 50 e-commerce sites (Amazon, Flipkart, Zalando). He tracked everything: checkout flow latency, abandoned cart email timing, psychological pricing patterns, and even the hex codes of “Buy” buttons that converted best. He didn’t just collect data; he built a framework. He called it the "Funnel-First Retention Model." e-commerce ritendra goel pdf