What innovative loyalty practice did Phoenician merchants use to maintain relationships with repeat customers across their Mediterranean trade network?

The ancient Phoenicians weren't just master sailors and traders - they were early pioneers of customer loyalty practices! As they established trade networks across the Mediterranean between 1500-300 BCE, these merchants developed sophisticated methods to maintain relationships with distant customers and trading partners. Their loyalty practices influenced commerce for centuries to come and established patterns we still see in modern retail loyalty programs.

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Clay tablet 'punch cards' that customers could redeem for discounts after collecting specific numbers of stamps
Personal trading tokens bearing family merchant marks that guaranteed preferential pricing and first access to new goods
Annual festivals where top customers were invited to exclusive banquets and given ceremonial gifts
Papyrus scrolls listing customer preferences and purchase history to personalize future trading interactions