Which ancient civilization first used clay tablets as 'loyalty tokens' that customers could exchange for discounts on future purchases, essentially creating the world's first customer loyalty program?

Before modern shopping malls and e-commerce, ancient civilizations developed sophisticated retail systems that shaped commerce for millennia. From the bustling agoras of Greece to the complex trade networks of Mesopotamia, these early retail innovations established patterns we still see today. This trivia question explores how one ancient civilization revolutionized customer loyalty and retail strategy with an invention that modern businesses still emulate in digital form.

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Mesopotamians (specifically Babylonian merchants)
Ancient Egyptians
Phoenician traders
Roman market vendors