What factors are contributing to the increased chargeback rate for NMI's ACH processing service this quarter?

Introduction

The increased chargeback rate for NMI's ACH processing service this quarter is a critical issue that requires immediate attention and a systematic approach to identify and address the root cause. As we delve into this analysis, we'll follow a structured framework to uncover the underlying factors contributing to this problem, validate our hypotheses, and develop both short-term and long-term solutions.

Step 1

Clarifying Questions (3 minutes)

• Given the sudden increase, I'm wondering about recent changes. Have there been any significant updates to the ACH processing system in the past quarter?

Why it matters: System changes could directly impact chargeback rates. Expected answer: Yes, there was a recent update to the fraud detection algorithm. Impact on approach: If confirmed, we'd focus on the new algorithm's performance.

• Considering user behavior, has there been a shift in the types of merchants using the ACH service recently?

Why it matters: Different merchant types may have varying chargeback risks. Expected answer: We've seen an increase in high-risk merchant categories. Impact on approach: We'd investigate merchant onboarding and risk assessment processes.

• Looking at the timing, I'm curious about seasonal patterns. Is this increase out of line with historical Q2 performance?

Why it matters: Seasonal fluctuations could explain some variance. Expected answer: The increase is significantly higher than previous Q2 periods. Impact on approach: We'd focus on non-seasonal factors if confirmed.

• Thinking about data integrity, has there been any change in how chargebacks are tracked or reported?

Why it matters: Reporting changes could create a false perception of increased chargebacks. Expected answer: No changes to tracking or reporting methods. Impact on approach: We'd rule out data anomalies and focus on actual performance issues.