In ancient Mesopotamia, what method did merchants use that resembled modern product reviews to establish trust with customers?

Before modern e-commerce platforms and review systems, ancient civilizations had their own methods of quality control and product recommendations. Different cultures developed various approaches to ensure fair trade and product reliability in their marketplaces. This trivia question explores how ancient Mesopotamians, one of history's earliest advanced civilizations, approached the concept of product quality assurance and consumer protection.

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Clay tablets with customer testimonials displayed at market stalls
The Code of Hammurabi, which included strict penalties for selling defective goods
Marketplace heralds who announced product quality ratings each morning
Temple certification marks stamped on approved products