Protect sensitive customer data, such as credit card or US social security numbers, in your tickets. This app will obfuscate all but the last 4 digits. The other numbers will show as an "X". The data are protected in the Ticket Subject and Description. The following credit card formats are covered in this app: 4242424242424242 Visa 4000056655665556 Visa (debit) 5555555555554444 Mastercard 2223003122003222 Mastercard (2-series) 5200828282828210 Mastercard (debit) 5105105105105100 Mastercard (prepaid) 378282246310005 American Express 371449635398431 American Express 6011111111111117 Discover 6011000990139424 Discover 30569309025904 Diners Club 38520000023237 Diners Club 3530111333300000 JCB 6200000000000005 UnionPay Disclaimer: This app will mask any data that resembles a credit card/social security number.