Which ancient civilization created the first known standardized retail payment system using clay tokens that functioned similarly to modern digital payment confirmations?

Before digital marketplaces and online shopping, ancient civilizations developed sophisticated trading systems that resembled modern e-commerce principles. From the Silk Road's complex supply chains to the standardized currency systems of Mesopotamia, these early commercial innovations laid the groundwork for today's global commerce. Test your knowledge about the fascinating commercial practices of ancient societies that mirror contemporary e-commerce concepts!

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Mesopotamia (c. 3500 BCE)
Ancient Egypt (c. 3000 BCE)
Indus Valley (c. 2600 BCE)
Ancient China (c. 1200 BCE)