Google and Mastercard Cut a Secret Ad Deal to Track Retail Sales
Google found the perfect way to link online ads to store purchases: credit card data
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For the past year, select Google advertisers have had access to a potent new tool to track whether the ads they ran online led to a sale at a physical store in the U.S. That insight came thanks in part to a stockpile of Mastercard transactions that Google paid for.
But most of the two billion Mastercard holders aren’t aware of this behind-the-scenes tracking. That’s because the companies never told the public about the arrangement.