Amazon EDI for Vendor Central: What First-Party Sellers Need to Know

Amazon Vendor Central vs. Seller Central

First, the distinction that trips up many brands: Amazon has two selling models, and only one involves EDI.

Seller Central (3P): You list products on Amazon's marketplace and fulfill orders yourself (or via FBA). No EDI required — Amazon handles this through their Seller Central portal and APIs. Vendor Central (1P): Amazon buys your products wholesale and resells them as "Ships from and sold by Amazon." This is a first-party relationship, and it requires EDI — Amazon sends you purchase orders and you ship to their fulfillment centers.

This guide covers Vendor Central. If you're on Seller Central, EDI doesn't apply to you.

How Amazon's EDI Differs from Other Retailers

Brands that already sell to Walmart or Target often assume Amazon's EDI works the same way. It doesn't. Here are the key differences:

1. Amazon Uses EDI *and* Their Portal

Unlike Walmart (which is heavily EDI-driven), Amazon provides a web portal called Vendor Central alongside EDI. Many operations can be done in either channel. This creates confusion about which is the source of truth.

The rule: If you're doing EDI, the EDI documents are the source of truth. The portal is for monitoring and exception handling, not for routine order management.

2. Amazon's PO Cadence Is Different

Walmart typically sends large POs for distribution center replenishment. Amazon's PO patterns are:

• Higher frequency — Amazon's forecasting engine generates POs more frequently, sometimes daily
• Smaller quantities — Many orders for fewer units, optimized for their FC network
• More FC destinations — A single week might include POs to 15 different fulfillment centers

This means higher document volume. Your EDI system needs to handle 50–100+ POs per week without bottlenecks.

3. The Confirmation Window Is Tight

Amazon expects PO confirmations fast. Their vendor manual specifies:

Miss the confirmation window and Amazon may cancel the PO — and unlike other retailers, Amazon's cancellation rate directly impacts whether they continue ordering from you.

4. Amazon Cares About Fill Rate — A Lot

Amazon tracks your confirmation rate (what percentage of PO units you accept) and your fill rate (what percentage of accepted units you actually ship). These metrics directly influence:

• Whether Amazon continues placing orders with you
• Your product's availability on the site
• Whether you get invited to promotional programs
• Your overall vendor scorecard

A declining fill rate can cause Amazon's buying algorithms to reduce orders or source from alternative suppliers — often without warning.

Amazon's Required EDI Documents

EDI 850 — Purchase Order

Amazon's 850s include standard PO data plus some Amazon-specific fields:

• Amazon FC code — determines which fulfillment center to ship to
• Window delivery dates — specific arrival windows at the FC
• Item identifiers — Amazon uses ASINs internally, but POs reference your UPC/EAN

EDI 855 — PO Acknowledgment

Your acknowledgment must specify:

• Accepted quantities per line item
• Expected ship date
• Backordered quantities (if any)

Key difference from Walmart: Amazon uses your 855 response to update their inventory forecasts in real-time. Consistently acknowledging then short-shipping will train their system to order less from you.

EDI 856 — Advance Ship Notice

Amazon's ASN requirements:

• Must include carrier SCAC code and tracking numbers
• Carton-level detail with SSCC-18 identifiers
• Ship date and estimated arrival date
• Each carton must have a GS1-128 label matching the ASN

Amazon-specific requirement: Amazon's FCs use the ASN to pre-assign dock doors and plan labor for receiving. A late or inaccurate ASN doesn't just cause a chargeback — it causes physical receiving delays that Amazon takes seriously.

EDI 810 — Invoice

Amazon invoices must:

• Reference the exact PO number
• Match shipped quantities from the ASN
• Use Amazon's agreed-upon pricing (from cost negotiations)
• Include the correct remit-to address

Amazon processes invoices through their Pay Central system. Discrepancies between your invoice and their records result in automated deductions — and disputing those deductions is a notoriously painful process.

Amazon-Specific Compliance Traps

1. The Prep Requirements

Amazon requires specific product preparation depending on the category — poly bagging, bubble wrapping, labeling, or "ships in own container" certification. These aren't EDI issues per se, but non-compliance at the FC results in chargebacks that appear on your EDI-adjacent remittance documents.

2. Routing and Transportation

For collect POs (where Amazon arranges freight), you must:

• Have the order ready by the specified pickup date
• Use Amazon's routing request process
• Meet their packaging and palletization standards

For prepaid POs (you arrange freight):

• Ship to the correct FC — Amazon specifies this on each PO
• Use an approved carrier
• Meet the delivery window exactly

3. The Chargeback Categories

Amazon's chargeback categories include:

4. The Volume Trap

Because Amazon sends frequent, smaller POs, brands sometimes treat them casually — manually processing a few POs per day. This works at low volume. But Amazon tends to ramp orders quickly when products sell well. A brand doing 10 POs/week can suddenly be doing 80 POs/week, and manual processes collapse.

The fix: Automate from day one, even if current volume feels manageable.

How to Set Up Amazon Vendor Central EDI

Step 1: Complete Vendor Onboarding

Amazon assigns you a vendor code and provides their trading partner specifications. You'll receive:

• Amazon's EDI qualifier and ID
• SFTP connection details for document exchange
• Their specific EDI implementation guide (which overrides standard X12 in several places)

Step 2: Configure Your EDI Platform

Your EDI system needs to support Amazon-specific:

• Document formatting (Amazon has custom requirements in several segments)
• High-volume PO processing (prepare for burst ordering)
• Multiple FC routing (each PO may go to a different destination)

Step 3: Test and Validate

Amazon requires a testing phase before going live. You'll exchange test documents and Amazon's compliance team validates them. Don't rush this — errors found in testing are free lessons. Errors found in production are chargebacks.

Step 4: Go Live and Monitor

Once live, monitor these metrics weekly:

• PO confirmation rate (target: 100%)
• Fill rate (target: 95%+)
• ASN accuracy (target: 99%+)
• On-time shipment rate (target: 95%+)

How JayChris EDI Handles Amazon

JayChris EDI supports Amazon Vendor Central alongside your other retail partners. The same platform that manages your Walmart and Target EDI handles Amazon's higher-frequency PO flow — parsing 850s, auto-generating 855 acknowledgments, creating ASNs at shipment, and invoicing with Amazon-specific formatting.

One dashboard. Every retailer. No per-transaction fees eating into your margins as Amazon's PO volume scales.