Walmart EDI Integration
Suppliers who sell to Walmart directly exchange X12 EDI documents: 850 purchase orders, 855 acknowledgments, 856 ship notices and 810 invoices. We build that EDI connection inside your ERP, against your own orders, inventory and shipments, with no external translation service. Selling on Walmart Marketplace instead? That runs on Walmart's API, which we cover separately.
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Walmart supplier EDI or Marketplace API?
Supplier EDI is for companies that sell to Walmart directly. Purchase orders, acknowledgments, ship notices and invoices move as X12 documents, to Walmart's routing and compliance rules.
The Marketplace API is for sellers who list on Walmart.com, including through WFS. Orders, shipment confirmations, returns and inbound shipments move through Walmart's API. See Walmart Marketplace API integration.
Which one applies depends on the Walmart program your account is enrolled in, not on your ERP. Confirm it before any mapping work is scoped. Walmart revises its routing guide over time, so check the current spec for your program.
Walmart EDI transaction sets we map
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850Purchase order. Walmart's PO format and item-mapping conventions, brought into your ERP as a real order against your own SKUs. -
855Acknowledgment. Confirmed quantity, cost and ship date, matched to Walmart's own compliance windows. -
856Advance ship notice. Walmart's routing guide governs carrier and appointment requirements closely, and a mismatch here is a common source of chargebacks. -
810Invoice. Matched against the ASN, the same discipline that prevents chargebacks across any retailer's EDI program.
How we build Walmart EDI inside your ERP
Built inside your ERP
Walmart's 850s become real orders against your own SKUs, and the 856 and 810 have to match what actually shipped, so there is no second system to reconcile.
Walmart's rules mapped once
Routing and compliance requirements specific to Walmart are built into the mapping logic directly, rather than handled ad hoc per shipment.
No external translation service
The X12 files are read and generated inside your ERP using the EdiFabric .NET library, with the mapping in your codebase, so Walmart traffic does not depend on an external translation service.
Shared infrastructure with your other channels
Walmart EDI would be built into the same ERP as your Amazon or other trading partners, not a separate tool to maintain.
The in-ERP EDI engine Walmart supplier EDI builds on
- Amazon Vendor Central EDI connected directly, with every X12 document generated and read inside the ERP.
- Vendor Central purchase orders accepted or rejected back to Amazon from the same screen that shows system, 3PL and allocated stock.
- EDI jobs run on schedule, each tracked on a monitoring dashboard, so rejected documents are diagnosed rather than escalated.
This is the in-ERP EDI engine that Walmart supplier EDI would be built on. In this project, Walmart itself runs through Walmart's API, not EDI. See Walmart Marketplace API integration for that work.
Read the full case studyWalmart EDI questions
Should we connect to Walmart over EDI or its API?
It depends on which Walmart program your account is enrolled in rather than on a preference. Supplier programs run on X12 transaction sets; marketplace selling runs on Walmart's API. Confirm the program first, because it decides the whole shape of the work.
Is Walmart EDI different from Amazon EDI?
The underlying ANSI X12 standard is the same, but Walmart's routing guide, compliance windows and specific requirements differ from Amazon's. We map each partner's actual requirements rather than assuming they are interchangeable.
What are Walmart compliance chargebacks, and can they be prevented?
Walmart penalizes late shipments, ASN mismatches and other compliance failures. We build the mapping inside your ERP so the ASN and the invoice are checked against the order and Walmart's routing guide before they go out.
Can we add Walmart alongside an existing Amazon EDI setup?
Yes. Each trading partner is mapped as its own integration inside the same ERP-based system, so adding Walmart does not touch what already works for Amazon.
Have you built a Walmart EDI connection before?
Our delivered Walmart work runs on Walmart's Marketplace API. Walmart supplier EDI would be built on the same in-ERP EDI engine that runs Amazon Vendor Central EDI, mapped to Walmart's own routing guide and compliance rules.
Do you handle Walmart's specific routing guide updates?
Yes. Routing guide changes are handled as updates to the mapping code inside your ERP, a change your team owns rather than a wait for a vendor to update a template.
Not sure whether Walmart wants EDI or API from you?
Tell us which Walmart program your account is on and what your ERP runs today, and we will tell you which connection the work actually needs.