EDI Requirements

Wayfair EDI Requirements

Wayfair is drop-ship-first: most suppliers ship direct-to-consumer (DS) against orders that flow through the Partner Home portal, while CastleGate suppliers send inventory into Wayfair’s own warehouse network for Wayfair to pick, pack, and ship. For both, EDI on ANSI X12 (reported as v4010) is the backbone, and the 846 inventory feed matters as much as the 856 because overselling is what gets suppliers suspended.

Required EDI documents

Document	Name	Notes
EDI 850	Purchase Order	orders also visible in Partner Home
EDI 855	PO Acknowledgment	prompt acknowledgment expected
EDI 856	Advance Ship Notice (ASN)	UCC-128/GS1-128 labels required
EDI 810	Invoice	must reconcile to the PO
EDI 846	Inventory Advice	reported ~3x daily to prevent overselling
EDI 860	PO Change	conditional
EDI 940	Warehouse Shipping Order	CastleGate / warehouse profile
EDI 945	Warehouse Shipping Advice	CastleGate / warehouse profile
EDI 997	Functional Acknowledgment

Labeling & packaging

GS1-128 (UCC-128) shipping labels required on all shipments, with an SSCC-18 that matches the 856 exactly.
GS1-licensed GTINs/UPCs required; carton and packing-slip formats follow Wayfair’s supplier operating standards.
Drop-ship parcels and CastleGate pallet/carton shipments have distinct labeling and routing rules — confirm which profile applies.

Connection & portal

AS2, sFTP/FTP, or an approved VAN (ANSI X12, reported as v4010); SPS, Cleo, TrueCommerce and similar providers can broker connectivity.
Partner Home is the vendor portal for orders, EDI setup tickets, scorecards, and day-to-day compliance visibility; the transactions themselves still move over EDI.
Reported to have no dedicated EDI test environment — certification is validated against live production orders, so mapping accuracy matters before go-live.

Onboarding & testing

Reported 2–4 weeks — faster than big-box first-party programs because the drop-ship model is lighter-weight and partner-controlled. Sequence: onboard as a supplier in Partner Home → submit an EDI setup ticket → establish AS2/sFTP/VAN connectivity → map and validate each transaction set (against production, since there’s no separate test environment) → go live.

Compliance & chargebacks

• Vendor scorecard drives compliance; misses on ASN accuracy, labeling, on-time ship, and invoice reconciliation are reported to trigger chargebacks (third-party sources describe exposure as medium-to-high; Wayfair’s fee schedule sits behind Partner Home).
• Inventory accuracy is enforced: overselling or stale 846 feeds are reported to risk order cancellation and account suspension, not just fees.
• Fulfillment must follow Wayfair’s supplier operating standards (SOPS) guide for routing, packaging, and ship timing.

Worth knowing

• CastleGate is Wayfair’s in-house fulfillment network — suppliers pre-position inventory in Wayfair warehouses and Wayfair ships to the customer, which changes the document mix (940/945) versus pure drop-ship.
• Reported to test against production rather than a sandbox, so a bad map surfaces on real orders — get mapping right first.
• The 846 inventory feed matters more here than elsewhere: Wayfair sells against your feed, so accuracy directly gates orders.

How EndlessEDI helps with Wayfair

Wayfair sells against your 846, so EndlessEDI keeps that feed accurate and frequent to stop oversells, then builds matching-SSCC 856s across both the drop-ship and CastleGate lanes with PO, ASN, and invoice reconciled to protect the scorecard. Interoperates with SPS if that’s your existing path in.

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Wayfair EDI FAQ

What EDI documents does Wayfair require?

Core documents are the 850 (PO), 855 (PO acknowledgment), 856 (ASN), 810 (invoice), 846 (inventory advice), and 997, on ANSI X12 (reported as v4010). CastleGate/warehouse suppliers add the 940 and 945; 860 is conditional.

What’s the difference between Wayfair drop-ship and CastleGate?

Drop-ship (DS) means you ship direct-to-consumer against Wayfair orders. CastleGate means you pre-position inventory in Wayfair’s warehouse network and Wayfair picks, packs, and ships — which brings warehouse documents like the 940/945 into the flow.

How important is the 846 inventory feed for Wayfair?

Very. Wayfair sells against your inventory feed, so a stale or inaccurate 846 causes overselling — reported to risk cancellations and even suspension. It’s frequently sent (reported around three times daily) and is as compliance-sensitive as the ASN.

EDI requirements and penalty schedules change and vary by program. Figures marked “reported” come from third-party sources, not the retailer’s published fee schedule — always confirm against the retailer’s current routing guide and your vendor agreement.