Which pioneering e-commerce innovation did Amazon patent in 1999, sparking controversy and changing online shopping forever?

Test your knowledge about a groundbreaking invention that revolutionized online shopping and transformed e-commerce forever. This innovation changed how consumers interact with products online and created an entirely new standard for the industry. Do you know enough about e-commerce history to identify this game-changing technology?

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1-Click purchasing technology
Product recommendation algorithm
Customer review system
Prime membership subscription model