Which ancient civilization pioneered a clay tablet 'loyalty system' where regular customers received tablets that could be exchanged for discounts on future purchases?

Before modern loyalty cards and digital rewards programs, ancient civilizations had their own methods of maintaining customer loyalty and tracking trade relationships. These early systems laid the groundwork for modern customer retention strategies and demonstrated a sophisticated understanding of consumer psychology. Test your knowledge of how ancient merchants kept their customers coming back!

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Mesopotamians (specifically Babylonian merchants)
Ancient Egyptians with their papyrus loyalty scrolls
The Phoenicians with their 'purple seal' program
The Romans with their 'civitas fidelis' (loyal citizen) tokens