EDI for Walmart — full spec, timelines and integration
In short: Walmart requires suppliers to exchange EDI 850 (PO), 855 (POA), 856 (ASN), 810 (Invoice), 820 (Remittance), 852 (POS), 997 (FA) via EDI. This page covers the Walmart EDI spec, AS2 transport, mandatory chargeback SLAs, ASN/label requirements, and how to get compliant in 2-4 weeks with a pre-built Walmart template on EDIconnect.
Key capabilities
- Pre-built Walmart spec: Every mandatory field, code, envelope value and validation rule from the current Walmart EDI implementation guide.
- Chargeback-safe ASN: GS1-128 SSCC label generation, pack hierarchy, timing rules — the exact combination that survives Walmart's DC receiving.
- AS2 transport included: Certificates, endpoints and connection testing with Walmart's EDI/VAN team — end-to-end, not just software.
- Live in 2-4 weeks: From contract to first production PO with Walmart — mapping, testing and go-live handled by EDIconnect.
Walmart EDI onboarding — the critical steps
Walmart's vendor onboarding is compressed and unforgiving: from vendor-code assignment to first production PO is typically 2-6 weeks, and any EDI failure delays merchandising launch. The winning pattern: assign the EDI spec to an experienced provider on day 1, run integration tests in parallel with item setup, and be certification-ready before the first PO drops.
EDIconnect's Walmart template has been in production with dozens of suppliers — the spec quirks, the label format edge cases, the SLA windows are all pre-configured. Suppliers we've onboarded typically hit zero chargebacks in the first 90 days.
Frequently asked questions
What EDI documents does Walmart require?
Walmart typically requires EDI 850 (PO), 855 (POA), 856 (ASN), 810 (Invoice), 820 (Remittance), 852 (POS), 997 (FA). Exact transaction set version and mandatory segments depend on your division/vendor category.
How do I get EDI-compliant with Walmart?
1) Get the Walmart EDI implementation guide from vendor portal. 2) Choose an EDI provider with a proven Walmart template. 3) Complete Walmart's EDI testing/certification. 4) Go live on the first PO.
Which transport protocol does Walmart use?
Walmart uses AS2 for all EDI. Endpoints, certificates and MDN reconciliation are handled by EDIconnect during onboarding — no need for you to run an AS2 server.
What are Walmart's EDI chargebacks?
Common categories: late ASN, missing SSCC label, PO-ship quantity mismatch, missing 997, mismatched carrier — each with a per-occurrence or percentage-of-invoice penalty.
Can EDIconnect handle this for me?
Yes. The Walmart template is pre-built and battle-tested. Your team never touches EDI schemas — you focus on filling POs; we handle 850/855/856/810/997 automatically.