Which ancient civilization pioneered the first known 'customer loyalty program' by issuing clay tokens that regular customers could exchange for discounts on future purchases?

Before modern malls and e-commerce, ancient civilizations created sophisticated marketplaces and retail experiences. From the grand bazaars of Mesopotamia to Roman shopping complexes, retail innovation has ancient roots. This poll explores how ancient civilizations approached customer experience in their marketplaces - an aspect of retail history that influenced practices we still use today.

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Ancient Egypt, where temple merchants gave 'favor of the gods' tokens to returning customers
Babylon, where merchants in the 6th century BCE issued 'sibsi' clay tokens to regular customers
Ancient Greece, where the Agora merchants provided 'citizen discount' pottery shards to locals
Roman Empire, where taberna owners gave 'patronus' metal coins to valued clientele