Which ancient civilization created the first documented customer loyalty program, where merchants gave clay tokens to regular customers that could be exchanged for discounted goods?

While modern loyalty programs seem like a recent innovation, ancient civilizations developed sophisticated customer retention strategies. From merchant guilds in Mesopotamia to trade networks in Rome, these early societies understood the value of repeat customers. This poll explores one of history's earliest documented customer loyalty systems and how it revolutionized commerce in its era.

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Ancient Egypt, where papyrus loyalty scrolls were marked with hieroglyphs for each purchase at royal marketplaces
Ancient Babylon, where clay tablets called 'sidku' were used as proof of repeated patronage at specific merchant stalls
Ancient Greece, where ceramic 'ostraka' tokens were distributed by Agora merchants to valued customers
Ancient Rome, where bronze 'fidelitas' coins were issued by trade guilds to reward repeat business