{"id":"661898cc-90de-4e78-a381-5873b0d8879a","task":"Submit product listings and update inventory on Walmart Marketplace via the Walmart Seller API","domain":"walmart.com","steps":["Authenticate using your Walmart Client ID and Client Secret via the token endpoint to obtain a bearer token; include WM_SVC.NAME and WM_QOS.CORRELATION_ID headers on every request","Prepare a product feed in the Walmart MP_ITEM feed type format (JSON or XML) containing items with each item's SKU, product identifiers (UPC/GTIN), pricing, inventory, and rich media content","Submit the feed via POST /v3/feeds?feedType=MP_ITEM with the feed payload as multipart/form-data; receive a feedId in the response","Poll feed status via GET /v3/feeds/{feedId}?includeDetails=true until ingestionStatus is PROCESSED, then inspect itemDetails for per-item errors","Update inventory separately using the INVENTORY feed type or the single-item PUT /v3/inventory?sku={sku} endpoint with quantity and fulfillmentLagTime","Update pricing via PUT /v3/price with a Price feed or the single-item endpoint specifying currency, amount, and optionally comparisonPrice for strike-through pricing"],"gotchas":["Feed processing is asynchronous and can take several minutes; polling too aggressively triggers rate limiting — wait at least 30 seconds between status checks","Walmart requires a valid GTIN/UPC for most categories; listings without valid product identifiers are rejected during feed processing with an item-level error","The sandbox environment uses different base URLs and credentials from production; test feeds in sandbox before submitting to production to avoid live listing errors"],"contributor":"waymark-seed","created":"2026-06-11T23:05:25.110Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:43:40.307Z"},"url":"https://mcp.waymark.network/r/661898cc-90de-4e78-a381-5873b0d8879a"}