Trade with REI – Fast, Easy, Scalable EDI Integration

Most suppliers are fully connected and processing live REI EDI transactions within 3–5 business days. Stacksync's no-code setup means you don't need developers or EDI consultants — configure your field mappings through our visual interface, run a test cycle, and go live.

REI typically requires the EDI 856 Advance Ship Notice to be transmitted within hours of shipment — not days before delivery. The ASN must be sent after the carrier picks up the freight but before the shipment arrives at REI's receiving dock. Late or missing ASNs often result in compliance chargebacks and can cause receiving delays at the distribution center. Stacksync triggers 856 generation automatically when your WMS or shipping system confirms dispatch, ensuring the ASN reaches REI within the required window without manual intervention from your logistics team.

REI EDI 850 Purchase Orders contain item-level detail including UPCs or GTINs, ordered quantities, unit pricing, ship-to addresses, and requested delivery dates. Key segments like BEG (beginning of the PO), PO1 (line items), N1 (party identification), and CTT (transaction totals) structure the document. REI sends 850s electronically through their EDI network, and each PO must be acknowledged with an 855 to confirm receipt. Stacksync parses these fields and maps them directly to your ERP or database so orders appear automatically without manual data entry or CSV imports.

REI EDI 810 Invoices must include the invoice number and date in the BIG segment, the original PO reference number, line-item detail with UPCs, quantities shipped, and unit prices in the IT1 segments, plus the total monetary value in TDS. REI requires exact alignment between the 810 Invoice, the original 850 Purchase Order, and the 856 ASN — this three-way match prevents deductions and chargebacks. Stacksync cross-validates all three documents automatically before transmitting the 810 to ensure every field matches REI's accounts payable validation rules.

A REI EDI 860 Purchase Order Change can modify quantities, prices, delivery dates, ship-to addresses, item substitutions, and add or cancel individual line items on an existing PO. The BCH segment specifies the change type — full replacement, partial change, or cancellation. REI uses 860s instead of canceling and reissuing entire 850s for efficiency, especially when only a few lines need adjustment. Stacksync processes incoming REI 860s by automatically updating the original PO record in your system, maintaining a change history for audit purposes.

REI generally prefers EDI 860 for modifications to existing POs rather than canceling and reissuing the entire 850. The 860 is more efficient because it targets specific changes — a quantity adjustment on one line item, a revised ship date, or an added line — without disrupting the rest of the order. Canceling and reissuing creates a new PO number and can cause confusion in warehouse operations. Stacksync handles both workflows, but when a REI 860 arrives, it applies the changes incrementally to your existing order record rather than creating a duplicate entry.

No. Stacksync handles the entire EDI transport layer. We connect directly to REI's trading partner network through our certified connections. You don't need to manage a separate VAN subscription, AS2 certificates, or SFTP configurations.

The REI EDI 856 uses hierarchical levels (HL segments) to describe the shipment structure from top to bottom: shipment level, order level, pack level (cartons or pallets), and item level. Each level contains specific data — the shipment level holds carrier and BOL information, the pack level includes SSCC-18 barcodes and carton dimensions, and the item level lists UPCs and quantities per package. Stacksync builds this hierarchy automatically from your WMS packing data, mapping carton contents and pallet configurations into the correct HL structure required by REI.

Stacksync processes incoming REI 850 Purchase Orders in real time, typically within seconds of receipt. The platform validates the X12 envelope, parses all segments, maps fields to your system's schema, and inserts the order record automatically. Unlike batch-processing EDI providers that run on scheduled intervals, Stacksync's event-driven architecture means your team sees new REI POs immediately. This speed is critical for meeting REI's tight fulfillment windows and maintaining high on-time in-full compliance scores.

Stacksync prevents REI 810 rejections through automated three-way matching. Before generating an invoice, Stacksync compares line-item quantities and pricing against the original 850 Purchase Order and the 856 ASN. Discrepancies in UPCs, unit prices, quantities, or allowance amounts are flagged before the 810 is transmitted, giving your team a chance to correct errors. The platform also validates REI-specific formatting requirements like date formats, decimal precision, and required qualifier codes. This preemptive validation eliminates the most common causes of REI invoice chargebacks.

Penalties for REI ASN errors vary by the type of mistake and your compliance scorecard tier. Common chargeable errors include missing or late ASNs, incorrect carton counts, wrong item quantities, invalid SSCC-18 labels, and mismatches between the ASN and actual received goods. These penalties can range from flat fees per incident to percentage-based fines on the shipment value. Stacksync validates every 856 against the original PO data and your shipping records before transmission, catching errors that would otherwise result in REI chargebacks. The platform maintains an audit trail for dispute resolution.

Stacksync improves compliance scores by eliminating manual processing delays. Purchase Orders sync to your system in real time, ASNs are generated automatically when you ship, and invoices are validated with three-way matching before submission. Real-time monitoring alerts you to issues before they become chargebacks.

Most REI compliance programs require the EDI 810 Invoice to be sent after the 856 ASN but within a specific window — typically 24 to 72 hours after shipment. Invoicing too early (before the ASN) or too late (beyond the allowed window) can trigger compliance penalties or payment delays. REI may also require that invoice dates match or follow the ship date on the corresponding 856. Stacksync automates this timing by generating the 810 automatically after the 856 is confirmed, ensuring correct sequencing and compliance with REI's deadlines.

When Stacksync receives a REI 860, it identifies the original PO by reference number, compares the changed fields against the current order in your system, and applies the updates automatically. Quantity increases or decreases are reflected in your ERP's line items, new lines are appended, and canceled lines are flagged. Stacksync maintains a version history showing what changed and when, making it easy to trace modifications for compliance auditing. If a change conflicts with your fulfillment status (e.g., reducing quantity on items already shipped), Stacksync alerts your team immediately.

The most frequent rejection causes for REI 850s include invalid UPC or GTIN codes, incorrect ship-to location identifiers, quantities that don't match REI's rounding requirements, and missing mandatory segments. Formatting issues like incorrect date formats in the DTM segment or invalid N1 qualifier codes also trigger rejections. Stacksync validates every incoming REI 850 against known compliance requirements before syncing to your system, flagging anomalies immediately rather than silently dropping the transaction.

The most common causes of REI 810 chargebacks include price discrepancies between the invoice and the PO, quantity mismatches between the invoice and the ASN, missing or incorrect allowance and charge amounts in the SAC segment, and wrong UPC or item identification codes. Late invoicing beyond REI's deadline also triggers deductions. Stacksync reduces these errors by automatically populating 810 fields from the matched 850 PO and 856 ASN data, ensuring consistency across all three documents and tracking deduction trends for resolution.

Most REI programs require SSCC-18 (Serial Shipping Container Code) labels on every carton and pallet, with the corresponding barcodes referenced in the 856 ASN's MAN (Marks and Numbers) segment. The SSCC-18 is a unique 18-digit identifier that links the physical package to the electronic ASN data, enabling REI's receiving dock to scan and verify shipments against the advance notice. Stacksync generates SSCC-18 numbers that comply with GS1 standards and embeds them in the 856 automatically. If your WMS already assigns SSCC-18s, Stacksync pulls those values directly from your packing records.

Stacksync supports all EDI document types required by REI — including Purchase Orders (850), Invoices (810), ASNs (856), PO Acknowledgments (855), and more. Our platform handles the full lifecycle from order to payment automatically.

REI typically requires an EDI 855 Purchase Order Acknowledgment for every 850 received. The 855 confirms that you received the PO and indicates whether you can fulfill it as ordered, need to modify quantities, or must reject specific line items. Most REI compliance programs expect the 855 within 24 to 48 hours of PO receipt. Stacksync can generate and send 855 acknowledgments automatically based on your acceptance rules, ensuring you never miss a compliance deadline. A 997 Functional Acknowledgment may also be required as a separate technical receipt.

Some REI trading programs require an EDI 865 (Purchase Order Change Acknowledgment) in response to every 860. The 865 confirms that you received the change request and indicates whether you accept the modifications, reject them, or need further negotiation. Even when not mandatory, sending an 865 is good practice because it closes the communication loop and prevents REI from resending the same change. Stacksync can generate 865 responses automatically based on your acceptance rules, similar to how it handles 855 PO acknowledgments.

Yes, REI can modify unit pricing on existing PO line items through the EDI 860. Price changes appear in the PO1 segment with updated unit price values. However, pricing changes via 860 may be subject to REI's vendor agreement terms — some programs restrict supplier-initiated price changes and only allow buyer-initiated modifications. Stacksync validates incoming REI 860 price changes against your contracted pricing and flags discrepancies. Your team can review and approve price adjustments before they flow into your billing system, preventing unexpected margin impacts.

Stacksync connects to your WMS, ERP, or shipping platform and monitors for shipment confirmations. When an order is marked as shipped, Stacksync extracts the packing details — carton contents, weights, dimensions, carrier information, tracking numbers, and SSCC-18 labels — and constructs the 856 ASN document automatically. The platform maps your warehouse data to REI's required HL hierarchy, populates the BSN, TD1, and REF segments, and validates the complete document before transmitting it. The entire process runs without manual EDI formatting, reducing ASN errors and keeping your REI compliance scores high.

Yes. Stacksync integrates with any system that has a database or API — including SAP, Oracle, NetSuite, Microsoft Dynamics, and custom-built ERPs. Data flows bidirectionally between REI's EDI network and your system in real time.

Stacksync uses a visual field mapping interface to connect REI 850 segments — such as BEG for PO header data, PO1 for line items, and N1 for party identification — to the corresponding fields in your ERP, WMS, or database. You configure the mapping once, and Stacksync applies it to every subsequent REI 850 automatically. The platform handles data type conversions, conditional logic for optional fields, and REI-specific formatting requirements. If REI changes their 850 specification, Stacksync alerts you and suggests mapping updates.

Yes. Stacksync supports the SAC (Service, Promotion, Allowance, or Charge) and TXI (Tax Information) segments used in REI 810 Invoices. The platform can apply REI-specific allowance schedules, cooperative advertising deductions, and volume rebates automatically based on the terms in the original PO. Tax calculations are handled according to the ship-to jurisdiction. Stacksync maps these calculations from your billing system's output to the correct EDI segment codes and qualifiers, ensuring REI receives properly formatted financial data.

Stacksync monitors REI's EDI spec changes and updates our mappings proactively. When a change affects your integration, we notify you and apply updates — so you stay compliant without scrambling to decode new implementation guides.