This filter compares the customer’s email address and credit card number against lists (that you create) of addresses and numbers for known bad customers.
Unlike the High Risk lists that PayPal owns and manages, you, solely, manage and update the Bad Lists.
Any transaction that is an exact match with an entry in one of your bad lists triggers the filter.
If you enable this filter, then your next step will be to set up lists of bad email addresses and bad card numbers. Be sure to type the email addresses and credit card numbers accurately. Enter only numerals in the credit card number list—no spaces or dashes.
Items that you enter in the Test Bad lists are not carried over to your configuration for the Live servers, so do not spend time entering a complete list for the Test configuration.
This filter enables you to block repeat fraud.
In the e-commerce world, once someone successfully performs a fraudulent transaction, they are very likely to try again. For this reason, you should set up lists of cards and email addresses and configure this filter to take action on transactions with data elements appearing in the bad lists.