From the Orders Menu, click Manage Orders, then click Fraudulent Transactions

This page lists orders that have been marked as fraudulent. This can be done by store admins on the Orders page, or by the payment gateway. Click the Order Number to view more information about the order.

The orders marked as fraud may be reviewed and if found not to be fraudulent, can be reset to valid using the "Clear Fraud Flag" option in the Order Processing Actions dropdown in the Payment Details section on the order. You may also need to clear the fraud flag in order to further take action on the order such as VOIDing it if desired. Marking orders as Fraud is just a flag in order for administrators to review the orders for validity. No messages are sent out and gateways are not notified. No inventory is adjusted.