WE knew this for years. Loyalty cards have been used to track data about you for a long time, but now they're learning how to sell it- paired with your debit ca

WE knew this for years. Loyalty cards have been used to track data about you for a long time, but now they're learning how to sell it- paired with your debit card (probably backed by VISA) they can correlate and track your purchase history across multiple stores.