In Pineda v. William Sonoma, the California Supreme Court has determined that merchants may not require credit card customers to provide ZIP codes. In a unanimous decision, the Court found that ZIP codes are "personal identification information" under the state Credit Card Act of 1971. In the Pineda case, the customer believed that providing an SSN was necessary to complete a credit card transaction. The merchant subsequently used the SSN to determine the customer's home address. The California court said that the Credit Card Act "intended to provide robust consumer protections by prohibiting retailers from soliciting and recording information about the cardholder that is unnecessary to the credit card transaction." For more information, see EPIC - Social Security Numbers and EPIC - Reidentification.
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