Update: Seller performance report adds five KPIs

Date: Septemer 11, 2026

Summary

The Seller performance report is expanding with five additional KPIs, giving sellers and Solution Providers a more comprehensive view of seller performance through the Performance webhook. The Refunds metric has also been removed because it has been decommissioned.

What changed

• Available September 14, 2026: Negative Feedback rate, Item Not Received rate, and Late Shipment rate.
• Planned for October 19, 2026: Returns - New and Returns - Resold.
• Refunds removed: The Refunds metric has been decommissioned and removed from the Seller performance report documentation.
• Updated documentation: The Seller performance report documentation will reflect the supported KPIs.

Scope

These changes apply to SELLER_PERFORMANCE_NOTIFICATIONS with payload.notificationType="REPORT". Seller performance alarms (payload.notificationType="ALARMS") are not affected.

Why it matters

The additional KPIs provide a more comprehensive view of seller performance within the tools sellers and Solution Providers already use to manage their Walmart Marketplace business.

With the expanded weekly report, you can:

• Monitor performance across more Marketplace standards.
• Surface additional performance issues in dashboards and workflows.
• Support operational reviews, coaching, and proactive follow-up.

Next steps

• Review your Performance webhook integration and prepare to process the additional KPIs as they become available.
• Update data mappings, dashboards, or workflows that process REPORT notifications.
• Remove dependencies on the Refunds metric.
• Review the updated Seller performance report documentation for implementation details.