What you do
Generate a client ID and secret in the Walmart Developer Portal and pass them over. That is the whole ask.
Walmart Marketplace Fulfillment
Walmart measures seven things. Fulfillment decides most of them.
Walmart Is the Strictest of the Big Marketplaces
Walmart requires valid tracking on 99% of shipments and on-time delivery on 90%, and falling short of the tracking standard can bring selling restrictions, suspension or termination. That is a narrower margin than eBay or Etsy allows, and it is not a target — it is the floor.
Valid Tracking Rate and On-Time Delivery
The two fulfillment does most directly. 99% and 90% respectively, as published in September 2026.Cancellation Rate
Driven almost entirely by overselling, which is an inventory-sync problem before it is a customer-service one.Item Not Received Rate
Usually a carrier-handoff or address-quality issue rather than a lost parcel.Return Rate, Response Rate, Negative Feedback
The remaining three, where fulfillment quality shows up indirectly through damage, accuracy and packaging.
The seven metrics Walmart watches:
Connecting Walmart Marketplace
Credentials come from the Walmart Developer Portal. The rest is ours.
What OC3PL does
Mapping, SKU matching, test orders and go-live, connecting directly to the warehouse management system.
How long it takes
Live the same business day for a direct connection.
What protects the 99%
Tracking is pushed back as soon as the parcel moves, and a scheduled carrier handoff is what turns a label into a valid, scanned tracking number.
Walmart Marketplace Questions
As published by Walmart and checked in September 2026: a Valid Tracking Rate of 99% or greater and On-Time Delivery of 90% or higher. Walmart also monitors cancellation rate, seller response rate, return rate, item-not-received rate and negative feedback rate. Failing the tracking standard can result in selling restrictions, suspension or termination.
A client ID and secret from the Walmart Developer Portal. The connection runs directly to the OC3PL warehouse management system and is live the same business day. OC3PL handles mapping, SKU matching, test orders and go-live.
Valid tracking is a physical event, not a data-entry one: the number has to be real and the carrier has to scan the parcel. A consistent scheduled carrier handoff is what sustains the rate, which is why it is a warehouse process rather than a software setting. Tracking is pushed back to Walmart as soon as the parcel moves.
Related Reading
The detail behind this, in OC3PL’s own guides.
Walmart Marketplace Fulfillment Integration
How OC3PL connects to Walmart Marketplace — a direct warehouse management system link using your Developer Portal credentials, live the same business day.
Marketplace Fulfillment: eBay, Walmart and Etsy
Selling on marketplaces means being measured on how you ship. How OC3PL connects to eBay, Walmart Marketplace and Etsy, and what each connection requires.
Carrier Management and Shipping Speed
OC3PL's carrier management and shipping speed services deliver same-day fulfillment and optimized carrier selection from our Orange County warehouse.
How OC3PL Integrations Work | WMS, API Keys and Go-Live
What connecting a store to OC3PL actually involves: one warehouse management system, an API key or app install from you, and mapping, SKU matching and test orders from us.
Multichannel Fulfillment From One Inventory Pool
Running a storefront and two marketplaces from one stock pool: how allocation works, what breaks when you split inventory per channel, and what to confirm before you do.
Retail & Wholesale Fulfillment Solutions
OC3PL offers B2B order fulfillment, retail compliance, palletized shipping, and integrations built for wholesale and multi-channel DTC operations.
Connect Walmart Marketplace
Send us your order volume and current tracking rate, and we will map what the connection needs.