Walmart EDI requirements for suppliers
Selling to Walmart by EDI means purchase orders in; acknowledgments, carton-level ship notices and invoices out; and Walmart’s own remittance and application advice to read. Here is what our Walmart maps handle, how onboarding runs, and what our engineers do for you.
- Walmart already in our map library
- 4–8 week go-live, paced by Walmart
- Same-day map changes
Walmart
- Received: 850 orders · 820 · 824
- Sent: 855 · 856 · 810 · 846
Comparatio
Translates, checks and monitors your documents
Your ERP
- Sales orders
- Shipments
- Invoices
- 1,000+
- pre-built trading-partner maps
- Nearly 8,000
- partner connections
- 4–8 weeks
- typical new trading-partner go-live, paced by the partner
- 103 min
- median map change (90 days to 28 Oct 2026)
Documents
The EDI documents Walmart trades with suppliers
Walmart sends purchase orders, remittance advice and application advice; you send back acknowledgments, ship notices and invoices, plus inventory advice for drop-ship. Each outbound document is built from your ERP’s own records.
| Document | Direction | What it carries |
|---|---|---|
| 850 Purchase order | From Walmart | Store and distribution-center orders, drop-ship vendor orders and facilities (MRO) orders |
| 855 PO acknowledgment | To Walmart | A status for each line |
| 856 Advance ship notice | To Walmart | GS1 SSCC carton IDs, item codes, department and merchandise type, pack details, and the GLN of the store or DC |
| 810 Invoice | To Walmart | Built from your invoice, with department and merchandise type |
| 846 Inventory advice | To Walmart | Stock levels for drop-ship vendor items, read from your ERP |
| 820 Remittance advice | From Walmart | Payment details; on Prophet 21, imported as cash receipts |
| 824 Application advice | From Walmart | Walmart’s report on a document it processed; errors are recorded against the original document |
Our main Walmart map sends ship notices and invoices in X12 version 5010. Inbound X12 documents are acknowledged with a 997 as your partners require.
Walmart specifics
What our Walmart maps take care of
Ship notices that match the cartons
Each 856 carries the GS1 SSCC ID of every carton, the item codes, department and merchandise type, and pack details, read from your shipment.
Stores and DCs by GLN
The ship-to store or distribution center is identified by its GS1 GLN, and translated to the right ship-to in your ERP.
Drop-ship vendor
Orders that ship straight to Walmart’s customer run on their own map: acknowledgment, ship notice and 846 inventory advice.
Walmart’s own reports
Walmart’s 824 application advice is read and recorded against the original document, and its 820 remittance advice comes in with the payment details.
Onboarding
Getting live with Walmart
A new Walmart connection typically goes live in 4–8 weeks, paced by Walmart’s testing.
Check your partner list
Run your partner list through the trading partner lookup, or send it to us. Walmart is already in our map library, so setup starts from a proven map.
Exchange IDs and connect
You and Walmart exchange EDI IDs and connection details. We set up the connection, whether AS2, SFTP or a VAN, including certificates.
Connect the map to your ERP
We tie the map to your ERP: items and the partner’s part numbers, ship-from locations, ship-tos and terms. You confirm the business rules.
Test with Walmart
Test documents go to Walmart until its testing signs off. This step sets the pace of the project.
Go live
Production orders start flowing, and our monitoring watches every document from the first day.
Managed EDI
How Comparatio runs Walmart EDI for you
Our engineers build and change the maps, run the partner testing, maintain the connection and act on monitoring alerts. Your team keeps the ERP records current and makes the business calls.
Monitored by engineers
Daily checks, set up per partner, flag a document Walmart never acknowledged or an invoice with no matching ship notice, and our team opens the ticket. In the 90 days to 28 Oct 2026, 61% of our tickets were opened by our own monitoring.
Same-day map changes
When Walmart changes a requirement, we change the map the same day, with no project queue: map changes took a median of 103 minutes in the 90 days to 28 October 2026.
Checked before it goes
Every outbound X12 document is checked against Walmart’s rules and reported, and can be held per partner.
Acknowledged as required
Inbound X12 documents are acknowledged with a 997 as your partners require. The 997s Walmart sends back are matched to the documents they answer.
Connections and certificates
We set up and maintain the AS2, SFTP or VAN connection to Walmart, including certificates and renewals.
Named engineers on every ticket
Questions go to engineers who know your setup, with a median first response of 79 minutes (Oct 2025–Oct 2026).
Your other partners
Check the rest of your partner list
Walmart is one of the partners in our library of 1,000+ pre-built maps. The trading partner lookup tells you which of your other partners already have a map.
FAQ
Walmart EDI questions, answered
Which EDI documents does Walmart require from suppliers?
The order cycle: Walmart sends 850 purchase orders, and suppliers send back 855 acknowledgments, 856 ship notices and 810 invoices. Our Walmart maps also send 846 inventory advice for drop-ship, and read Walmart’s 820 remittance advice and 824 application advice. Inbound X12 documents are acknowledged with a 997 as your partners require.
Which Walmart programs do you cover?
Store and distribution-center orders, the drop-ship vendor program, and Walmart facilities (MRO) orders. Each runs on its own map in our library.
How long does Walmart EDI onboarding take?
Typically 4–8 weeks from start to go-live, paced by Walmart’s testing. Walmart is already in our map library, so setup starts from a proven map.
What is a Walmart 824, and what do you do with it?
The 824 application advice is Walmart’s report on a document it received, such as an invoice or ship notice. We read it and record any error against the original document, so it can be corrected and resent.
What happens when Walmart changes its EDI requirements?
We change the map the same day, with no project queue: map changes took a median of 103 minutes in the 90 days to 28 October 2026.
Talk through your Walmart EDI
Bring a sample Walmart purchase order and your partner list, and we’ll walk through each document and what your onboarding looks like.