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It works like this: a person searches for "red lipstick" on Google, clicks on an ad, surfs the web but doesn’t buy anything. Later, she walks into a store and buys red lipstick with her Mastercard. The advertiser who ran the ad is fed a report from Google, listing the sale along with other transactions in a column that reads "Offline Revenue" -- only if the web surfer is logged into a Google account online and made the purchase within 30 days of clicking the ad. The advertisers are given a bulk report with the percentage of shoppers who clicked or viewed an ad then made a relevant purchase.