Walmart EDI: requirements & onboarding

Walmart-specific onboarding context

• Walmart EDI requirements center on Retail Link's EDI-B2B setup, direct AS2 or WebEDI connectivity, and strictly validated ASNs and invoices — we help you pass Walmart's sequential certification testing without building an EDI department.
• Walmart EDI onboarding window: 8–12+ weeks. Walmart's certification testing is sequential — AS2 connectivity, then 850/997, then 855, 856, and 810 — and submissions are reviewed in queue order in Retail Link, which is what stretches new-supplier timelines. Chargeback risk is highest around ASNs and invoices — budget time for exception handling, not just first message exchange.
• Walmart EDI document checklist includes 850 (Purchase Order) — inbound POs; Walmart transmits test 850s to your endpoint during certification; 855 (PO Acknowledgment) — accept, reject, or change responses; 856 (ASN/Ship Notice) — carton- and pallet-level hierarchy with SSCC-18 label correlation; Walmart validates the ASN before the shipment arrives.
• Sandbox and validation so 850/855/856/810 flows match Walmart's published supplier expectations before production traffic.

What documents they require

Walmart supplier programs exchange core order-to-cash X12 over a direct AS2 connection or WebEDI (Global Enterprise Mailbox), configured and tested in Retail Link's EDI-B2B app (versions and qualifiers per your commodity). Typical document families include: Exact specs come from your partner packet — treat this as a planning checklist, not a substitute for their current implementation guide.

• 850 (Purchase Order) — inbound POs; Walmart transmits test 850s to your endpoint during certification document guide →
• 855 (PO Acknowledgment) — accept, reject, or change responses document guide →
• 856 (ASN/Ship Notice) — carton- and pallet-level hierarchy with SSCC-18 label correlation; Walmart validates the ASN before the shipment arrives document guide →
• 810 (Invoice) — price, quantity, and unit of measure must match the PO to avoid deductions document guide →
• 997 (Functional Acknowledgment) — both directions; Walmart verifies your 997 turnaround during testing document guide →
• 820 (Remittance) / 846 (Inventory) — when payment advice or drop-ship inventory visibility is in scope for your program document guide →

Connectivity and testing requirements

Average onboarding time

8–12+ weeks

Walmart's certification testing is sequential — AS2 connectivity, then 850/997, then 855, 856, and 810 — and submissions are reviewed in queue order in Retail Link, which is what stretches new-supplier timelines. Chargeback risk is highest around ASNs and invoices — budget time for exception handling, not just first message exchange.

How SignalEDI handles it

• Sandbox and validation so 850/855/856/810 flows match Walmart's published supplier expectations before production traffic.
• ASN structure checks — HL hierarchy, SSCC-18 label correlation, and PO reference integrity — before files leave your control, since ASNs and invoices carry the most chargeback exposure.
• AI-assisted mapping and partner-profile onboarding with SOC 2-ready audit trails, so your team isn't re-learning X12 from Retail Link PDFs on day one.

Self-serve evaluation, published pricing, and API-first flows — aligned with how lean teams actually ship EDI. Developer QuickStart

Pricing

Transparent tiers on our pricing page — Starter through Enterprise — with usage-based expansion as your document volume and partner count grow. Standard SMB onboarding is self-serve, with no mandatory quote request.

FAQ

What EDI documents does Walmart typically require?

Walmart supplier programs exchange core order-to-cash X12 over a direct AS2 connection or WebEDI (Global Enterprise Mailbox), configured and tested in Retail Link's EDI-B2B app (versions and qualifiers per your commodity). Typical document families include: Typical sets include: 850 (Purchase Order) — inbound POs; Walmart transmits test 850s to your endpoint during certification; 855 (PO Acknowledgment) — accept, reject, or change responses; 856 (ASN/Ship Notice) — carton- and pallet-level hierarchy with SSCC-18 label correlation; Walmart validates the ASN before the shipment arrives; 810 (Invoice) — price, quantity, and unit of measure must match the PO to avoid deductions — plus program-specific sets. Exact specs vary by commodity and program — always confirm against your trading partner packet.

How long does Walmart EDI onboarding usually take?

Many suppliers land in about 8–12+ weeks, but timelines vary by category, testing waves, and exception cycles. Walmart's certification testing is sequential — AS2 connectivity, then 850/997, then 855, 856, and 810 — and submissions are reviewed in queue order in Retail Link, which is what stretches new-supplier timelines. Chargeback risk is highest around ASNs and invoices — budget time for exception handling, not just first message exchange.

How does SignalEDI help without hiring a full EDI team?

Sandbox and validation so 850/855/856/810 flows match Walmart's published supplier expectations before production traffic. ASN structure checks — HL hierarchy, SSCC-18 label correlation, and PO reference integrity — before files leave your control, since ASNs and invoices carry the most chargeback exposure. AI-assisted mapping and partner-profile onboarding with SOC 2-ready audit trails, so your team isn't re-learning X12 from Retail Link PDFs on day one.

Where can I see SignalEDI pricing?

Transparent tiers on our pricing page — Starter through Enterprise — with usage-based expansion as your document volume and partner count grow. Standard SMB onboarding is self-serve, with no mandatory quote request.

Related EDI resources

• Managed EDI services — add a SignalEDI operator to coordinate this partner launch end to end.
• QuickBooks EDI integration — turn Walmart documents into reviewable QuickBooks drafts without re-keying.