Amazon Seller Central and GXO
Integration Agency & Consultants
Operational pressure usually peaks when Amazon Seller Central orders arrive at the GXO warehouse too slowly or with incorrect stock data, leading to customer complaints and lost sales. At lower volumes, teams can manually bridge the gap, but scale exposes the risk of overselling and compromised account health. We connect Amazon to GXO to ensure warehouse execution stays in step with marketplace demand. By synchronising inventory levels and shipment status, we remove the manual work and fulfilment errors that stall growth.
Audit existing marketplace and warehouse gaps
We connect your Amazon Seller Central and GXO integrations quickly, supporting Marketplaces and WMS/3PL connections for efficient operations. Our consulting services are invaluable, with system audit services that uncover inefficiencies and integration gaps across Amazon Seller Central, GXO, Marketplaces, and WMS/3PL. These audits empower both our consultants and your team to take decisive action, ensuring your technology ecosystem runs smoothly and efficiently. This enables you to deliver a consistently excellent experience to your customers.
Solution Design
The design for Amazon Seller Central and GXO prioritises GXO as the source of truth for inventory and Amazon as the master of the order status until injection. We typically sequence the inventory sync first to protect the marketplace account from overselling. While high-frequency pushes reduce oversell risk, we often implement a safety buffer in Amazon to compensate for GXO batch processing cycles. For international orders, we design the SKU mapping to carry mandatory customs data, reducing manual warehouse intervention. This trade-off between frequent updates and system stability ensures the finance team can trust the settlement reports at month-end. The architecture gives ops a clear view of fulfilment capacity while CX sees accurate delivery promises.
Map carrier codes and inventory batches
In an Amazon and GXO integration, the warehouse typically acts as the source of truth for available stock, while Amazon remains the source of truth for order intent. Orders flow from Seller Central to GXO on a defined schedule or trigger, where SKU mapping ensures the correct items are picked. GXO usually requires a fixed Facility ID in the order payload to ensure the shipment is routed to the correct warehouse location.
Inventory updates generally flow from GXO back to Amazon listings. This available-to-sell quantity is typically pushed as a batch update to protect against overselling. Once GXO completes a shipment, the fulfilment status and tracking information are passed back to Amazon. The integration must correctly map GXO's carrier service codes to Amazon's supported carrier list to ensure customers receive accurate tracking details. Managing this data flow effectively prevents reconciliation gaps and ensures the warehouse remains aligned with marketplace demands.
Orchestrate workflows on secure middleware
Leveraging IPaaS with ISO 27001 and SOC 2 and above security accreditations enables secure, efficient integration between Amazon Seller Central, GXO, Marketplaces, and WMS/3PL systems. This approach simplifies connecting Amazon Seller Central and GXO to Marketplaces and WMS/3PL, ensuring data protection and compliance. IPaaS platforms offer centralised management, automation, and scalability, making integrations more reliable and secure for businesses handling sensitive data and complex supply chain operations.
Monitor operational exceptions and sync integrity
High-volume Amazon operations require visibility that goes deeper than simple "up or down" monitoring. Success at the API level does not always mean success on the warehouse floor. Errors often hide in the data mapping, such as Amazon carrier service codes not aligning with GXO shipping methods or missing SKU data for international shipments.
Effective monitoring surfaces these operational exceptions before they impact Amazon account health. By focusing on data integrity across the order-to-fulfilment cycle, teams can identify failures such as stalled inventory updates or tracking numbers that fail to post back to Amazon. Visibility typically focuses on:
- Order Movement: Ensuring "Unshipped" orders from Amazon Seller Central flow into GXO without getting stuck in a queue. - Inventory Integrity: Monitoring the sync between GXO's available-to-sell stock and Amazon inventory levels to prevent overselling. - Fulfilment Confirmation: Tracking the return of shipping data from GXO to ensure Amazon orders are closed and payments are captured. - Mapping Exceptions: Flagging when new products or shipping routes lack the required GXO facility codes or carrier mappings.
Handover for internal data ownership
Handover ensures your ecommerce and operations teams take ownership of the Amazon and GXO operating model. We provide a clear map of data ownership, showing where SKU data, inventory levels, and order statuses are mastered. Your team learns to monitor for sync failures and manage common triggers like SKU mapping errors or international delivery gaps. We define the daily and weekly checks required to prevent inventory drift and reconcile fulfilment totals. Documentation is provided as a practical operational manual for the people running the business, not a technical archive, ensuring your team handles exceptions and marketplace demand confidently.
Manage status drift and warehouse exceptions
Ongoing support protects the reliability of the data flow between Amazon and GXO. We monitor for common sync failures where orders might stall or inventory levels diverge. Our approach focuses on resolving data mapping errors and status drift before they impact your Amazon account health or customer delivery promises. This includes monitoring of the integration layer and a clear path for resolving warehouse exceptions, ensuring your fulfilment operations stay in step with marketplace demand.
Common failures
Duplicate fulfilment of FBA orders Failing to filter out Amazon FBA (AFN) orders from the data feed results in duplicate fulfilment and inventory sync corruption. If GXO receives orders that are already being handled by Amazon's own warehouses, it wastes stock and creates double-shipping errors. The integration must only push Merchant Fulfilled (MFN) orders to GXO to maintain stock accuracy.
Mapping errors and Safe-T claims Failure to map the Amazon Order ID to GXO's primary reference field makes it impossible to reconcile chargebacks or losses through Amazon's Safe-T claims portal. Without this specific data link, ops teams cannot prove delivery or warehouse handling to Amazon, leading to unrecoverable financial losses on disputed orders.
Late shipment rate risks GXO's batch processing cycles often misalign with Amazon’s 'Late Shipment Rate' windows. If the WMS does not emit a parcel manifest before the 24-hour cutoff, it requires a ship-confirm push. A common failure occurs when GXO reports a 'Partial Shipped' status for a single-line order, as Amazon requirements specify a quantity integer to close the order correctly and trigger payment capture.
Frequently asked questions
How do we prevent overselling on Amazon if GXO manages our stock?
The integration designates GXO as the source of truth for inventory. When GXO confirms a shipment or receives stock, it updates inventory levels, which are then synchronised with the relevant SKU on Amazon Seller Central. This ensures the quantity listed on Amazon accurately reflects physical stock in the warehouse, preventing the sale of unavailable items.
How are Amazon orders routed to the correct GXO warehouse?
GXO's system typically requires a specific 'Facility ID' or 'Warehouse Code' to be present in the sales order data it receives. The integration logic must map information from the Amazon Seller Central order to the correct GXO facility code. If this mapping fails, GXO will reject the fulfilment request, causing a shipping delay that impacts the customer.
Why don't the amounts in Amazon's payout reports match our sales orders?
Amazon's settlement reports rarely match individual sales orders fulfilled by GXO because they group multiple orders and deduct various fees, advertising costs, and rolling reserves ('Unavailable Balances'). For an accurate month-end close, reconciliation logic cannot assume a one-to-one match between a GXO shipment and an Amazon payout. The integration must correctly attribute the netted payout amount across multiple sales orders.
How do you handle Amazon's anonymised customer email addresses?
Amazon replaces real customer emails with a proxy address (e.g., @marketplace.amazon.com), which can create duplicate customer records if used as a unique identifier. The integration should instead use a stable identifier like the 'MerchantOrderID' from Amazon Seller Central to link the order to the fulfilment request in GXO. This maintains a clean customer record and allows for accurate order tracking.