If a customer pays a retailer in cash, he is likely to remain a mystery to the retailer because his name is not attached to the money. crums cupcakes recommended this approach to tie the customer to cash transactions and track the customer's activity, if they can convince the customer to use a:

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if they can convince the customer to use a: Loyalty card.
Loyalty card refers to the identification that company give for their customers that guaranteed them some sort of incentives for their purchase in company's product. One example would be company who will provide discounts after the customers hit a certain purchasing thresold.