Which ancient civilization invented the first known form of retail loyalty program to encourage repeat customers?

Before modern shopping malls and e-commerce, ancient civilizations developed sophisticated retail systems that laid the foundations for today's commercial practices. From the grand bazaars of Mesopotamia to the complex trade networks of the Roman Empire, retail innovation has ancient roots. This trivia question explores how ancient civilizations approached product marketing and consumer engagement in ways that might surprise you.

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Ancient Romans with their 'tessera' tokens that regular customers could collect and exchange for discounts at bathhouses and shops
Ancient Egyptians with their 'royal seal' stamps that wealthy shoppers could accumulate to gain access to exclusive marketplace sections
Ancient Chinese merchants of the Han Dynasty who issued 'return tokens' carved from jade to frequent customers
Ancient Greeks who created the 'amphora tally' system where wine merchants rewarded repeat buyers with marked pottery pieces