Walmart US item requirements vary by product type and can change.

Retrieve the current taxonomy, select the exact product type, and use the Get Spec API or current downloadable product-type spec before constructing an item feed. Rebuild the included preparation JSON to match that schema exactly. Do not upload this notice or submit the preparation JSON unchanged.

Official guidance checked 2026-07-21:
https://developer.walmart.com/us-marketplace/docs/item-management-api-overview-1
