One of our merchants is experiencing increased fraud. How would you address this issue?

Focus on identifying key metrics that can help diagnose the fraud issue, such as the rate of fraudulent transactions, chargeback rates, and customer complaints. Consider the merchant's transaction volume and the types of fraud being reported. Discuss potential strategies for mitigating fraud, including implementing enhanced verification processes, analyzing transaction patterns, and collaborating with the merchant to improve security measures. Be prepared to suggest how you would measure the effectiveness of these interventions over time, emphasizing both short-term and long-term metrics.