Microsoft Retail management system will mask credit card numbers in the database, as in the example below. This action cannot be undone.

Original credit card number: 1111 2222 3333 4444
Masked credit card number: XXXX XXXX XXXX 4444
NOTE: Credit card numbers on journaled receipts will not be masked.

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This is an additional security feature to prevent misuse of credit card information. This was an added feature to version 2.0.