Walmart EDI requirements
ANSI X12 4010/5010 · AS2 (mandatory) · Onboarding: 4–8 weeks · Portal: Retail Link
Core EDI documents
| Code | Document | Direction | Notes |
|---|---|---|---|
| 850 | Purchase Order | Inbound | Foundation of every Walmart transaction |
| 855 | PO Acknowledgment | Outbound | Must respond within 24 hours |
| 856 | Advance Ship Notice | Outbound | Must be sent before shipment arrives — most chargeback-prone document |
| 810 | Invoice | Outbound | Must reconcile with 850 and 856 |
Additional documents
Compliance requirements
- GS1/GTIN compliant product identification (UPC barcodes)
- GS1-128 shipping labels with SSCC codes
- AS2 security certificates must be exchanged before testing
- Certification testing required before go-live
- OTIF (On-Time In-Full) scorecard tracked in Retail Link
- Web EDI available for very low-volume suppliers only
Supplier types
Domestic, Direct Import, DSD, Marketplace
Chargeback risk
High — automated chargebacks for ASN errors, late shipments, and invoice mismatches
Typical onboarding
4–8 (industry average)