Amazon inventory sync with the SP-API: what developers need to know

Operations that matter

• Listings Items PATCH — the modern path for quantity and price updates on an existing SKU.
• Listings Items PUT — full submission when creating or replacing a listing.
• Product Type Definitions — fetch the live schema for validation before you submit anything.
• Orders — poll or subscribe for the order events that decrement source stock.

Rate limits and durability

Every operation has a per-seller rate and burst allowance. A robust integration queues work, respects the returned x-amzn-RateLimit-Limit header, applies exponential back-off on 429 and 503, and persists queue state so an interrupted run resumes rather than restarts.

Schemas change without notice

Amazon updates product-type definitions continuously. Integrations built on cached templates fail silently when a new attribute becomes required. Fetching the definition at submission time — and monitoring it for changes — is the only reliable approach.

Step by step with SellerApex

1. 1

   Authorise with OAuth

   Use an approved Appstore app rather than self-managed credentials where possible.

2. 2

   Fetch the live schema

   Validate the payload against the current product-type definition.

3. 3

   Submit and track

   PATCH quantities, then poll the submission status per SKU.

4. 4

   Handle throttling

   Queue, back off, resume — never drop.

Frequently asked questions

Keep reading