Which innovative customer retention strategy did Phoenician merchants pioneer around 1200-800 BCE that is still widely used in modern retail?

The Phoenicians were among history's greatest traders and merchants, establishing vast trade networks across the Mediterranean. Their innovative retail practices and customer retention strategies helped them dominate ancient commerce for centuries. Test your knowledge about how these ancient retailers created loyal customers and built one of the most successful trading empires in history.

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Loyalty tokens - ceramic coins given to repeat customers that could be exchanged for discounts on future purchases
The 'royal purple' exclusive program - offering special purple-dyed garments only to returning customers of high status
Seasonal festival discounts - reducing prices during religious celebrations to attract repeat business
Trade route memberships - allowing frequent customers to join protected merchant caravans for a fee