There are special configuration varables in the Data::Dumper namespace that you can set to control how object are dumped. My advice would be to create a dump filter, (see: http://www.effectiveperlprogramming.com/blog/312) or to make use of $Data::Dumper::Freezer
With $Data::Dumper::Freezer you provide the name of a class method that Data::Dumper will attempt to call on each object it dumps, and if that method exists, the object returned will be dumped instead of the original object, so for your class containing credit card numbers you could provide a hide_secrets() method that blanks out or encypts the secrets. For other classes there will be no such method, so they will be dumped as they are.
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