This article is relevant if you rely on a point-to-point integration between NetSuite and Amazon Seller Central and need to prepare for Amazon’s upcoming migration to the Solution Provider Portal (SPP) effective August 31, 2025. This is especially critical for organizations managing Fulfillment by Amazon (FBA) and exploring Amazon Warehousing and Distribution (AWD) to streamline inbound logistics.
TL; DR: Summary
If you’re using NetSuite with Amazon FBA or exploring Amazon Warehousing and Distribution (AWD), this article shows how to prepare for Amazon’s August 31, 2025 transition to the Solution Provider Portal (SPP) and new APIs. We rebuilt our integration to support Amazon’s latest Fulfillment Inbound and AWD APIs, enabling smarter shipment planning, optimized packing and transport, and direct AWD order flows—all while maintaining NetSuite-native control with enhanced Transfer Orders and custom controller records. The result is a license-free, cost-efficient solution that gives you full visibility, accurate reconciliation, and seamless Amazon alignment—without relying on middleware or recurring fees.
Background: NetSuite and Amazon’s Fulfillment Shift
In March 2024, I published an article detailing a point-to-point integration between NetSuite and Amazon Seller Central. This model gave our clients full ownership of their Amazon FBA flows without recurring platform fees, leveraging NetSuite’s native structures with tailored automation. That article has a supporting video and outlines the fundamentals of the flows.
Subsequently, Amazon deprecated the Fulfillment Inbound API, with a replacement by the updated Amazon Fulfillment Inbound API v2024-03-20. This change culminates in the full migration to the Solution Provider Portal (SPP) by August 31, 2025. In parallel, Amazon launched the Amazon Warehousing and Distribution (AWD) API to help sellers move goods into Amazon’s regional DCs for storage, redistribution, and replenishment.
We anticipated these changes and completed a comprehensive revamp of our Amazon integration in late 2024, with full production stabilization in 2025. Our solution now supports both SP-API and AWD API structures, enabling businesses to model NetSuite-driven fulfillment with deep control, visibility, and minimized costs.
Transfer Orders in NetSuite: When Standard Logic Falls Short
NetSuite’s Transfer Orders serve as the logical anchor for initiating Amazon-bound shipments. Yet Amazon’s fulfillment systems differ markedly from NetSuite’s receipt and inventory models. Amazon allows delayed, partial, and even negative receipts across a multi-month timeline, whereas NetSuite expects immediate, reconciled receipts against expected values. This is not an easy information management coordination.
To bridge this gap, we developed augmented controller records. These records track Amazon receipt data cumulatively, delaying NetSuite posting until Amazon marks the shipment as fully received. This approach prevents duplicate or out-of-sync postings, ensures clean accounting, and preserves the audit integrity of NetSuite’s inventory management structures.
Click the images to see them full-screen to gain a better understanding of the flows and considerations.
Business Logic Advancements that Capitalize on Amazon’s New API Framework
The migration to Amazon’s latest Fulfillment Inbound API isn’t just a technical upgrade; it’s a strategic opportunity. With richer decision data available mid-process, we’ve overhauled the logic that governs how NetSuite clients prepare and structure inbound shipments. The result is better control, lower fees, and greater clarity across the fulfillment cycle.
Shaping Shipments with Cost-Aware Intelligence
Amazon now exposes variables that materially impact cost: carton thresholds, placement splits, dangerous goods classifications, and dispersal behaviors. We’ve implemented logic that reads these inputs and restructures the shipment accordingly, before it’s committed. This enables:
- Shipment packaging that meets zero-fee criteria: where viable, shipments are sized to qualify for Amazon-optimized placement (e.g., five-carton minimums).
- Elimination of wasteful splits: our algorithms compare placement offers in real time, weighing shipment count, distance, and total fees.
- Predictable cost outcomes: clients can define fee tolerance policies that drive automatic selection of the lowest-cost, highest-conformance route.
Integrated Decision Support, Delivered in NetSuite
All of this business logic operates directly within NetSuite; users get visualizations, audit trails, and interactive dashboards tied to the native record. These dashboards show:
- Placement fee comparisons across shipment scenarios.
- Cost savings realized through optimized carton structuring.
- Real-time visibility into Amazon’s fluid receive process and how it resolves within NetSuite’s rigid model.
We designed this logic to eliminate surprises. Our clients now get shipments that are intentional, cost-contained, and program-compliant—without introducing manual review. This is what happens when system thinking with proper modeling meets modern API access: leverage.
Our Integration Approach: Smarter Inventory Transfers and Cost Optimization
With Amazon’s expanded API capabilities, we redesigned our integration architecture to take advantage of both the SP-API and AWD API. Key enhancements include:
- Inbound Plan Requests (SP-API): replacing the legacy two-step model, Amazon now requires a five-step workflow to generate valid inbound plans. Our system manages asynchronous calls to:
- Packing Option Evaluation: Amazon’s
listPackingOptionsAPI exposes item groupings, packing configurations, fees, and discounts. We apply cost models to choose the most advantageous option per shipment. - Amazon-Optimized Shipment Splits: we detect conditions for zero-fee optimized placement—e.g., shipments with five or more cartons per SKU—and select splits via:
- Transport Mode Optimization: programmatically choose carriers based on cost, timing, and shipment dispersal:
- AWD Inbound Order Integration: With Amazon’s new AWD API (v2024-05-09), our solution supports direct flows to Amazon distribution centers:
checkInboundEligibility– Verify SKU and package eligibility for AWD.createInbound/updateInbound/confirmInbound– Manage order creation and updates.getInbound/getInboundShipment– Retrieve order and shipment-level details.getInboundShipmentLabels– Generate printable box labels for AWD intake.updateInboundShipmentTransportDetails– Provide carrier and tracking info.listInboundShipments– Track all active or historical AWD orders.listInventory– Access real-time AWD storage and replenishment visibility.
- Unified Dashboarding Across Amazon Channels: our use of the Prolecto Query Renderer enables dashboards on NetSuite records to show combined AWD and FBA shipment status, variance analysis, and inventory state tracking.
- Single Record Model with Dual Channel Control: by modeling both SP-API and AWD transactions through a shared NetSuite Transfer Order interface, our clients enjoy a unified, extensible system that tracks complex Amazon flows without operational overhead.
Implementation Details
Our implementation reflects both strategic modeling and precise API-level integration:
- Transfer Orders anchor Amazon interactions in NetSuite.
- Packing options and splits are cost-optimized using fee-aware selection logic.
- Shipment tracking and receipt validation occurs across both SP-API and AWD channels.
- Inventory reconciliation models honor NetSuite’s accounting rules while adapting to Amazon’s flexible warehouse behaviors.
- Real-time visibility is embedded into key records for rapid operational response.
This makes our solution robust, forward-compatible, and practical for day-to-day operations.
Prolecto’s Advantage: Smarter Models, Better Execution
This solution was shaped by a close collaboration between Jacob P., Senior Business Analyst in our Operations Practice, and Chidi Okwudire, Technology Practice Manager. Together, they translated business requirements into a sophisticated, highly integrated NetSuite system.
What sets us apart is our Prolecto Labs Initiative. We don’t charge recurring fees for the solution. Instead, we equip clients with extensible, transparent logic that enhances NetSuite’s core, reduces operational friction, and improves inventory and financial accuracy.
Conclusion: Expert NetSuite Leadership
As Amazon retires its legacy APIs and introduces powerful new logistics capabilities via SPP and AWD, now is the moment to modernize your NetSuite integration strategy. Our approach gives you control, visibility, and peace of mind, all backed by a system that scales as Amazon’s fulfillment programs evolve. This is what it means to unlock NetSuite’s potential.
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