Overview

Amazon has rolled out a refreshed version of its Warehousing and Distribution (W&D) API, going live this month. The upgrade introduces additional data elements and new workflow options that let sellers track inbound shipments with finer granularity and confirm exactly what arrives at Amazon fulfillment centers. Sellers who depend on the API for inventory planning, shipment reconciliation, and stock‑on‑hand reporting need to adjust their integrations to capture the new fields.

Key Points

• totalInboundQuantity field — The listInventory endpoint now returns a numeric totalInboundQuantity that sums every unit currently on its way to a W&D location for each SKU, enabling a single‑call view of in‑transit stock.
• SKU‑level reconciliation — By exposing both expectedQuantity (what the seller shipped) and receivedQuantity (what Amazon records), the API allows automatic per‑SKU variance calculations without manual spreadsheet cross‑checks.
• Real‑time transit visibility — A new transitStatus attribute reports whether inventory is “in‑transit,” “arrived,” or “delayed,” giving sellers an up‑to‑the‑minute signal of inbound movement.
• Enhanced error reporting — When a shipment deviates from expectations, the response includes an errorCode and a readable errorMessage that identify issues such as labeling mismatches or carrier exceptions.
• Batch processing support — Calls to listInventory can now request up to 1,000 SKUs in a single request, dramatically cutting the number of HTTP calls required for large catalogs.
• Rate‑limit adjustments — Authenticated sellers receive a 20 % increase in throttling limits, allowing more frequent inventory checks during peak periods without hitting caps.

How the Updated API Works

1. Initiate listInventory request — The seller issues a GET /wds/v1/inventory call, optionally filtering by SKU, warehouse ID, or date range; the response now bundles , , and detailed for each line item.