post https://marketplace.walmartapis.com/v3/feeds
Upload a feed file to update stock for many SKUs at once.
Query string options:
• feedType=inventory: Spec 1.4; one ship node per file; XML or JSON.
• feedType=MP_Inventory: Spec 1.5; multiple ship nodes in one file; JSON only.
Post the feed as multipart/form-data (field name file). Check throttle limits before you upload. For details on throttling, refer to the Walmart throttling documentation.
Refer to the Bulk Inventory guide for full specs and sample files.