Date: June 04, 2026

Walmart Marketplace now supports late shipment performance insights through two new endpoints: a summary view and an order-level report download. Suppliers can monitor late shipment risk and trends, understand what’s driving late shipments (seller-accountable vs. non-accountable drivers), and then download an .xlsx report of the exact orders impacting performance to speed up operational troubleshooting and corrective action.

What changed

• Added:
  • GET /v3/insights/performance/lateShipment/summary endpoint (Retrieving a late shipment summary) that gives sellers late shipment performance summary metrics and trend interpretation.
  • GET /v3/insights/performance/lateShipment/report endpoints (Retrieving a late shipment orders report) where sellers can download an .xlsx file of orders impacting late shipment metrics.
• Impacted areas:
  • Insights performance APIs for late shipment (summary + report workflows)
  • Documentation and partner operational dashboards (summary metrics + order-level drill-down)

Why it matters

These capabilities make it easier to monitor and troubleshoot late shipment performance in a single workflow:

1. Detect: Pull summary metrics to spot rising risk, worsening trends, or spikes in impacted orders.
2. Diagnose: Use driver breakdowns to understand what’s changing (seller-accountable vs. non-accountable).
3. Resolve: Download the order-level report to investigate the specific orders behind the metric impact and drive operational fixes faster.

Next steps

• Update your integration to call the Late shipment summary endpoint for dashboards and automated monitoring.
• Use the Late shipment orders report endpoint to investigate impacted orders and operational root causes.
• Confirm your implementation:
  • Generate a unique WM_QOS.CORRELATION_ID per request.
  • Use a valid WM_SEC.ACCESS_TOKEN.
  • Set reportDuration (or rely on the default of 30 days).
• Test in a non-production environment before rolling into production workflows.