3PL and WMS EDI Integration: Managing EDI Across Multiple Fulfillment Partners

Using a third-party logistics provider (3PL) for fulfillment introduces a critical compliance question: who owns EDI accuracy? The answer is always you — the supplier. Even when your 3PL ships the product, any EDI errors are your chargebacks.

The 3PL EDI Challenge

When you use a 3PL:

• The 3PL generates shipping data (weights, dimensions, carrier info, tracking numbers)
• You need to create an accurate EDI 856 ASN from that data
• The ASN must be sent to the retailer within their required window

If your 3PL sends you shipping data late, or sends it in a format that doesn’t integrate with your EDI system, you miss the ASN window.

Common 3PL Integration Approaches

Manual File Exchange
The 3PL sends you a shipping file (CSV, Excel) and you manually create the ASN. Error-prone and slow.

EDI-to-EDI
If your 3PL has EDI capability, they can send you an EDI 856 from their WMS. You transform it into the retailer’s required format and retransmit.

API Integration
Modern 3PLs and WMS platforms (ShipBob, 3PL Central, Extensiv) offer APIs. Spring Systems can connect to your 3PL’s API and generate ASNs automatically at the moment of shipment.

Direct WMS Connection
If your 3PL uses a major WMS (Manhattan Associates, HighJump, SnapFulfil), Spring Systems may have a direct connector.

Best Practices

• Require your 3PL to provide shipping data within 30–60 minutes of carrier pickup
• Audit 3PL ASN accuracy monthly
• Have a backup process for days when 3PL system integration fails
• Include EDI compliance as a contractual requirement with your 3PL