When you sign up for one of these loyalty cards, you have to give them certain personal details and permission to use your data for certain purposes. You get small discounts/bonuses for scanning the card when you buy something, which incentivizes you to do so. They use this to build up a detailed picture of your spending habits. They can then make targeted offers to entice you to shop there more frequently, can use the data they collect on everyone to inform their business decisions, and may also sell it on to other companies.
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