BigCommerce EDI Integration: Selling to Major Retailers

The BigCommerce EDI Problem

If you're running your ecommerce business on BigCommerce and trying to sell to major retailers like Walmart, Target, or Kohl's, you've probably noticed something: almost every EDI solution on the market is built for Shopify.

The major EDI providers advertise Shopify integrations prominently. Their documentation is Shopify-first. Their onboarding teams know Shopify. When you ask about BigCommerce, you get a vague answer about "API integration" and a longer timeline.

This is a real gap. BigCommerce is a serious platform — it powers thousands of B2B and DTC brands doing significant volume. And yet the EDI industry has largely treated it as an afterthought.

Here's the good news: connecting BigCommerce to major retailer EDI networks is absolutely possible. The key is understanding how EDI actually works, and why platform-agnostic solutions outperform Shopify-only tools for brands on any other platform — including BigCommerce.

How BigCommerce Connects to EDI

EDI (Electronic Data Interchange) is a set of standardized document formats that retailers use to exchange business data — purchase orders, order confirmations, shipping notices, invoices — with their vendor partners. It's a requirement for selling to Walmart, Target, Kohl's, and most other major retailers at scale.

BigCommerce itself doesn't have native EDI functionality, but it has a robust API that makes integration straightforward. Here's how the connection works:

The BigCommerce API acts as the integration layer. When Walmart sends you a purchase order (EDI 850), the EDI system receives it, translates it into a standard order format, and creates the order in BigCommerce via API. Your team sees it in BigCommerce like any other order. Order processing stays in BigCommerce. Your existing fulfillment workflows, inventory rules, and warehouse integrations continue to function normally. The EDI layer operates around them, not instead of them. EDI documents generate automatically from BigCommerce data. When you ship an order, your EDI system reads the shipment data from BigCommerce and automatically generates the Advance Ship Notice (EDI 856) and transmits it to the retailer. No manual entry required. Invoices generate from fulfilled orders. Once an order ships, the EDI system generates and transmits the EDI 810 invoice to the retailer, pulling the data directly from your BigCommerce order record.

What Retailers Require

Regardless of your ecommerce platform, major retailers require the same core EDI documents:

Retailers also require vendor certification before you can begin trading electronically. This involves testing your EDI setup against their specifications — typically in a sandbox environment — before going live. The certification process is the same regardless of whether you're on BigCommerce, Shopify, or a custom platform.

Why Platform-Agnostic EDI Beats Shopify-Only Tools

When you evaluate EDI solutions for BigCommerce, you'll encounter two categories:

Shopify-native tools that have added BigCommerce support as an afterthought. These solutions are built around Shopify's data model and app architecture. BigCommerce integration is often a second-tier feature with less support, slower updates, and more manual workarounds. Platform-agnostic tools that connect to any ecommerce system via API, treating the platform as a data source rather than a core dependency. Your retailer connections, document mapping, and compliance logic are completely independent of which platform you're on.

For BigCommerce merchants, the difference matters for several reasons:

Retailer certifications don't depend on your platform. When you certify with Walmart or Target, that certification is tied to your trading partner ID — not your ecommerce platform. If you ever migrate to a different platform, a platform-agnostic EDI setup means you don't need to recertify. A Shopify-native tool would require rebuilding from scratch. Your operational logic stays consistent. Order routing rules, inventory thresholds, fulfillment triggers — these are configured at the EDI layer, not the platform layer. Platform-agnostic systems let you define these rules once and apply them regardless of where orders originate. Multi-platform is possible. Many BigCommerce merchants also operate a Shopify storefront, a wholesale ordering portal, or a custom B2B site. Platform-agnostic EDI handles all of them simultaneously. Shopify-native tools can't.

For more on this distinction, see our companion guide: [Why Platform-Locked EDI is a Trap](/blog/why-platform-locked-edi-is-a-trap).

Connecting BigCommerce to Walmart

Walmart's EDI program (operated through Walmart Retail Link) is one of the most structured in retail. Here's what connecting BigCommerce to Walmart looks like in practice:

1. Vendor application and approval. You need an approved vendor relationship with Walmart before EDI setup begins.

1. EDI provider selection and setup. Your EDI provider configures the connection to Walmart's AS2 or SFTP network and sets up the required document mappings (850, 855, 856, 810).

1. BigCommerce API integration. The EDI system connects to your BigCommerce store via API credentials. Order creation, shipment reads, and inventory sync are configured.

1. Sandbox testing and certification. You run test transactions through Walmart's certification portal until all document types pass validation.

1. Go-live. Purchase orders begin flowing into BigCommerce automatically. Acknowledgments, ASNs, and invoices transmit without manual involvement.

The timeline from setup to go-live is typically 3–6 weeks, depending on how quickly your team can complete the BigCommerce API configuration and Walmart certification testing.

Connecting BigCommerce to Target and Kohl's

Target and Kohl's follow the same general process, with retailer-specific document requirements:

Target uses their Partners Online portal and requires vendors to complete EDI certification through their vendor compliance program. They're particularly strict about ASN timing and carton-level accuracy. Kohl's operates through their vendor compliance portal and requires ASN transmission before carrier pickup — earlier than most retailers. Their invoice matching requirements are also specific and must be configured carefully in the EDI mapping layer.

Both retailers integrate with BigCommerce the same way as Walmart — via API — and the retailer-specific requirements are handled at the EDI mapping layer, not the platform layer.

What to Look for in a BigCommerce EDI Provider

When evaluating EDI solutions for BigCommerce, ask these questions:

• Is BigCommerce a first-class integration, or an afterthought? Ask to see their BigCommerce documentation. Ask how many BigCommerce merchants they actively support.
• Do they handle retailer certification? Certification requires back-and-forth with retailer compliance teams. Your provider should manage this process, not hand it back to you.
• Is the integration API-based or file-based? API-based integrations are real-time and reliable. File-based integrations (SFTP drops, CSV exports) are slow and error-prone.
• What happens if you migrate platforms later? The answer should be: nothing changes on the retailer side.

The Bottom Line for BigCommerce Merchants

BigCommerce is a capable, enterprise-ready platform. The EDI industry's Shopify bias doesn't reflect the reality of the brands using BigCommerce to sell to major retailers — it just reflects which platform got there first.

If you're on BigCommerce and you're pursuing or managing relationships with Walmart, Target, Kohl's, or other major retailers, the path forward is clear: use a platform-agnostic EDI solution that treats BigCommerce as an equal integration target, not a secondary option.

Your retailer compliance, your chargeback prevention, and your vendor scorecard don't care what ecommerce platform you're on. Your EDI setup shouldn't either.