When testing a Data Filtering profile that's configured to block credit card numbers, administrators can generate a file containing 16-digit numbers to check against the Data Filtering profile. If these numbers are not valid credit card number formats, the Data Filtering condition does not trigger an alert or block.
Issue
For security reasons, don't test using valid credit card numbers. Palo Alto Networks firewalls use the Luhn Algorithm to test valid credit card numbers, substantially reducing the likelihood of a false positive, but also making testing more challenging.
Solution
The following ten numbers were pseudo-randomly generated using a Luhn algorithm, and were subsequently checked against a ruleset on several firewalls to ensure accuracy. They are of a MasterCard style, but should suffice for the general credit card test.