The passage is about Mustafa Madi, a mystery shopper whose job is to visit shops, restaurants, and other places pretending to be a regular customer. After each visit, he reports on his experience—evaluating things like customer service, cleanliness, and staff behavior. He started this job as a student because it offered flexible hours. His work has taken him to various stores and even abroad, like his favorite trip to Berlin. Mustafa explains that being a mystery shopper requires good memory, strong writing skills, and the ability to act naturally. Although the pay isn’t always high and the work isn’t constant, he enjoys the variety and satisfaction of knowing his reports help improve customer service.