3PL for Amazon FBA
Operational tension usually peaks when Amazon FBA and a 3PL operate without synchronised data. At scale, reconciling inventory levels across split fulfilment nodes becomes an expensive manual burden that risks overselling. This integration establishes a controlled flow of order data and inventory updates between Amazon and your 3PL, ensuring that status updates and stock counts remain in step. We focus on resolving the common failure points of duplicate orders and fulfilment delays, providing a stable operating model for dual-channel logistics.
Audit inventory gaps and system inefficiencies
Connect your Amazon FBA, 3PL, Marketplaces, and WMS/3PL systems quickly and efficiently. Our consulting services are invaluable for businesses using Amazon FBA, 3PL, Marketplaces, and WMS/3PL, as our system audit services uncover integration gaps and inefficiencies. This enables both our consultants and your team to take decisive action, ensuring your tech ecosystem operates smoothly and efficiently. As a result, you can deliver an outstanding experience to your customers and keep your operations running at their best.
Solution Design
For Amazon FBA and 3PL integrations, we typically designate the 3PL as the source of truth for stock held in their facility, while Amazon remains the authority for FBA warehouse counts. A core design decision involves how order references are mapped between systems to ensure carriers can successfully book delivery appointments at Amazon Fulfilment Centres. We prioritise syncing inventory based on pickable warehouse quantities rather than total supply to prevent overselling stock that is still in transit between locations. Batching financial data for settlement reconciliation ensures accuracy for the finance team, even if it introduces a slight lag in intra-day reporting. This sequenced approach prioritises order-to-fulfilment flows, ensuring the operations team has reliable visibility of stock movements across both fulfilment channels before layering in complex return or removal logic.
Syncing inventory and marketplace order flows
The integration typically positions the 3PL system as the authoritative source for non-Amazon stock, whilst Amazon holds authority over FBA inventory. Orders are ingested from Amazon and mapped to the 3PL system, where fulfilment status is updated and pushed back to the marketplace. We implement data mapping rules to ensure SKU consistency and prevent duplicate order creation during sync retries. Inventory levels are synchronised on a defined schedule to protect against overselling, often with safety buffers applied to protect high-velocity items. By embedding monitoring at the integration layer, we detect sync failures or data mismatches early, ensuring that marketplace availability matches warehouse reality.
Securing data flows via accredited middleware
Leveraging IPaaS with ISO 27001 and SOC 2 and above security accreditations enables secure, efficient integration of Amazon FBA, 3PL, Marketplaces, and WMS/3PL systems. This approach simplifies connecting Amazon FBA and 3PL to Marketplaces and WMS/3PL, ensuring data protection and compliance. IPaaS platforms offer centralised management, automation, and scalability, making complex integrations for Marketplaces straightforward and secure, while meeting the minimum requirements of ISO 27001 and SOC 2 and above.
Surfacing reconciliation errors and data drift
Standard dashboards often hide the quiet failures that impact Amazon FBA and 3PL operations. A successful sync might show a healthy status yet mask an inventory mismatch caused by an unmapped SKU or a rejected settlement report. We provide visibility into these gaps, surfacing reconciliation errors and fulfilment delays before they lead to marketplace penalties.
The focus is on monitoring the integrity of the total data flow, highlighting when an order is stuck between systems or when stock levels fail to update on a defined schedule. This allows your team to move toward proactive management, ensuring you see the hidden issues that usually compound into customer service backlogs and inventory misalignment.
Handing over operational ownership to teams
Operations, finance, and ecommerce teams attend a handover focused on the split fulfilment operating model. We define the inventory ownership boundary, ensuring the team knows which system controls stock counts for FBA and merchant-fulfilled items. Training covers how to read integration alerts, manage SKU mapping exceptions, and perform the daily checks needed to prevent inventory drift. Documentation is delivered as a series of operational procedures for the people running the business, rather than a technical archive. This puts your team in control of the day-to-day sync between Amazon and your 3PL.
Hypercare and proactive data health monitoring
Our support model focuses on ongoing operational ownership, ensuring your Amazon FBA and 3PL sync remains stable after launch. We monitor for specific exception types such as orphaned orders, SKU mismatches, or stock sync timeouts that typically disrupt marketplace operations. If an issue arises, we handle the escalation and resolution, preventing data drift from compounding into fulfilment errors. This goes beyond basic maintenance; we monitor the health of your order data to ensure inventory levels and fulfilment statuses remain accurate. Your team has a clear path for resolving sync failures, backed by a team that understands the commercial impact of logistics delays.
Common failures
Overselling due to Total Supply sync
Operational impact: Syncing inventory based on 'Total Supply Quantity' instead of 'AFN-Warehouse-Quantity' leads to overselling. This occurs because Total Supply incorrectly includes inventory currently in transit between Amazon fulfilment centres. Merchants end up taking orders for stock that is not yet available for dispatch, resulting in cancelled orders.
Prevention / Action: Configure the integration to pull the 'AFN-Warehouse-Quantity' field for FBA listings. This ensures that the available-to-sell count only includes stock that is physically pickable within the Amazon network.
Rejected FBA Inbound Shipments
Operational impact: When the 3PL dispatches a replenishment shipment, carriers are often turned away from the Amazon Fulfilment Centre. This happens because the 'Shipment ID' was not correctly mapped in the 3PL outbound order. The result is costly redelivery fees and stalled inventory that should be live on site.
Prevention / Action: Ensure the mapping logic injects the Amazon Shipment ID into the 3PL's primary reference field. This ensures the ID appears on the carrier's paperwork, which is a requirement for securing delivery appointments at Amazon centres.
Unidentified FBA Removal Orders
Operational impact: Amazon FBA removal orders sent back to the 3PL often arrive without clear documentation. Warehouse teams cannot reconcile the stock, leading to unidentified goods sitting in the warehouse. This creates a backlog and delays when stock should be moved back to sellable inventory.
Prevention / Action: Use the LPN (License Plate Number) on the Amazon return label to identify the original removal request. Mapping this identifier within the integration layer allows the 3PL to recognise the shipment and process the return without manual investigation.
Frequently asked questions
How do we prevent 3PL stock from feeding FBA listings?
Operating both FBA and Merchant Fulfilled (FBM) listings requires strict inventory partitioning to avoid logic errors. Inventory updates from the 3PL are typically mapped exclusively to Merchant Fulfilled listings, as FBA listings rely on Amazon's internal warehouse counts. Pushing 3PL 'On Hand' stock to FBA listings can cause stock discrepancies and account health issues.
How are FBA removal orders handled by the 3PL?
Amazon removal orders frequently arrive at a warehouse without a standard packing slip or clear PO reference, which can stall the receiving process. The 3PL team can identify these shipments by using the License Plate Number (LPN) on the shipping label to match the original removal request. This allows for faster processing of returns back into sellable stock without the warehouse team having to manually identify the origin of the delivery.
Why are shipments sometimes rejected at Amazon centres?
Delivery rejections generally occur when a carrier attempts to book a slot without the correct Amazon Shipment ID. If this ID is not mapped to the primary reference field in the 3PL outbound order, the carrier lacks the data required for a delivery appointment. Ensuring this mapping is consistent at the 3PL level prevents pallet rejections and the resulting carrier surcharges.
Can we reconcile Amazon payments and fees automatically?
The integration typically uses Amazon Settlement Reports to reconcile disbursements against order data. Because Amazon settlement data does not always align 1:1 with individual orders, the system parses these reports to separate product totals from FBA-specific fees. This helps manage reconciliation and allows for a cleaner month-end close by correctly categorising Amazon's tax and fee withholdings.