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.
See the Bulk Inventory guide for full specs and sample files.