Google and Mastercard are secretly tracking your offline purchases


Google has quietly been providing select advertisers a “stockpile” of offline credit card transaction data. After a four year negotiation, Google and Mastercard reached a deal that would pay the latter millions in exchange for coughing up data on its card holders, according to a Bloomberg report. Google then packaged the data into a new tool, called Store Sales Measurement, that allowed its customers to track whether online ads turned into real world retail sales. Neither company informed its users of the arrangement. For Mastercard, that means the bulk of its two billion customers have no knowledge of the behind-the-scenes…

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