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If you already have a Customer Number and you would like to update the information associated with that number, please download and complete the. Customer Number Data Change form [PDF] and fax it to the Electronic Business Center at 571-273-0177.nce you have both codes, you will be able to access Private PAIR and take advantage of electronic filing via EFS-Web. For any customer who would like to receive their Reference Number before it arrives via U.S. mail, please contact the Patent EBC at 1-866-217-9197.