What EDI documents does Costco require?

Most Costco supplier programs center on order-to-cash X12 sets — typically 850 purchase orders, 855 acknowledgments, 856 advance ship notices, and 810 invoices. Additional sets vary by category; confirm against your Costco Connect implementation guide.

How long does Costco EDI onboarding take?

Industry averages land around 2–8 weeks, but timelines depend on test cycles, DC routing, and exception handling in Costco Connect. SignalEDI helps your team get technically ready in days, not weeks while the retailer controls certification approval.

Can SignalEDI help avoid retailer chargebacks?

SignalEDI validates ASN, PO reference, and invoice alignment before files leave your control — catching mismatches early reduces the chargeback exposure common on high-volume retail programs.

Retailer EDI requirements

Costco EDI requirements

Costco-proprietary (based on X12) · SPS Commerce (mandatory onboarding partner) · Portal: Costco Connect · Typical onboarding: 2–8 weeks

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Costco-specific compliance context

Costco Connect is the vendor portal for certification and day-to-day compliance visibility.
Typical onboarding window: 2–8 weeks before production cutover (partner-controlled).
High chargeback exposure when ASN, invoice, or label rules drift.

Core EDI documents

Code	Document	Direction	Notes
850	Purchase Order	Inbound	Acknowledge within 24 hours
855	PO Acknowledgment	Outbound	Line-by-line confirmation
856	Advance Ship Notice	Outbound	GS1-128 barcode must match ASN exactly — per-pallet deductions for mismatches
810	Invoice	Outbound	Must match PO and ASN
997	Functional Acknowledgment	Both	Required for all transmissions

Compliance requirements

All onboarding goes through SPS Commerce — Costco's designated partner
Product approval through vendor portal required first (~2 months)
GS1-128 barcodes required on every pallet and carton
Lot codes mandatory for perishable products
Costco-proprietary data mappings differ from Walmart and Target formats
Compliance deadline enforced — new suppliers must be live immediately after approval

Supplier programs & chargeback risk

Programs: Warehouse Suppliers, E-commerce, Import

Chargeback exposure: High — per-pallet deductions for ASN/barcode mismatches, delayed payments for invoice errors

Trading partner profile

See mandate context, connectivity options, and onboarding steps on the Costco trading partner page.

Trust & proof

Built for SMB teams that need API-first EDI, healthcare diligence, and predictable pricing.

SignalEDI keeps the public promise consistent across every route: real-time processing, transparent monthly plans, no per-document fees, QuickBooks-friendly handoffs, and core healthcare X12 workflows on paid plans.

HIPAA-aware handlingBAA path documentedSecure API + webhooksNo per-document fees

Operations teams

“A supplier operations team can see partner setup, validation, exceptions, and QuickBooks handoff in one workspace instead of chasing spreadsheets.”

Healthcare billing

“837, 835, and 270/271 workflows are explained in plain English, with HIPAA-aware handling and a documented BAA review path for diligence.”

Developer teams

“JSON/CSV in and X12 out, with API docs, webhooks, real-time status, and validation responses that make EDI feel like modern infrastructure.”

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