Credit card numbers are immaterial, especially for Google's use case of showing advertisers that their spending is resulting in tangible, offline purchases. Tra

Credit card numbers are immaterial, especially for Google's use case of showing advertisers that their spending is resulting in tangible, offline purchases. Transaction amount and a timestamp combined with Android Location data is enough to deanonymize most customers. Any extra data like partial names, cardholder addresses, rewards program data (provided by the advertiser) will only enhance this dataset and generate more matches