Which groundbreaking feature did Amazon patent in 1999 that revolutionized e-commerce and is now standard across virtually all online shopping platforms?

The world of retail has been transformed by technological innovations that changed how we shop forever. This trivia question focuses on a pivotal moment in e-commerce history that revolutionized online shopping and set the standard for modern digital retail experiences. Test your knowledge of the technological breakthroughs that shaped today's digital marketplace!

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1-Click purchasing technology
Customer review systems
Personalized product recommendations
Prime subscription model