A standalone notification system, including a notification server which generates electronic messages for alerting customers of potentially fraudulent activity on one or more of their financial accounts. Alternatively, or in addition thereto, the notification system may be used to forward transaction code(s) to customers for verification of a request for high risk transaction(s) with respect to a customer's financial account. The transaction code is generated in response to a high risk transaction request and sent to through an identified customer notification means, e.g., e-mail, short message service (“SMS”), facsimile, mobile phone, telephone, etc. The customer must enter the transaction code within a predetermined amount of time in order to verify the high-risk transaction request.