Retailer Guides12 min readMarch 8, 2026

How to Start Selling to Walmart: EDI Requirements Explained

Walmart has some of the strictest EDI requirements in retail. This guide walks businesses through every document, protocol, and compliance requirement you need to get approved and stay in good standing.

Becoming a Walmart supplier is a major milestone for any small business. But Walmart's EDI requirements are notoriously strict, and non-compliance results in chargebacks and potential de-listing. Walmart requires suppliers to exchange specifically formatted EDI documents via AS2 protocol. The key documents include: 850 (Purchase Order), 855 (PO Acknowledgment), 856 (Advance Ship Notice), 810 (Invoice), and 997 (Functional Acknowledgment). EDIPlug has pre-built mapping files for all Walmart EDI requirements, which means we can get you live in days — not months.

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EDI 850, 856, 810 — What These Document Numbers Actually Mean

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