What Is CastleGate Multichannel Fulfillment?

A CastleGate service that uses stored inventory to fulfill eligible orders from sales channels other than Wayfair.

CastleGate Multichannel Fulfillment A CastleGate service that uses stored inventory to fulfill eligible orders from sales channels other than Wayfair. This service lets merchants and warehouses route stock held in CastleGate locations to customer orders originating from other online marketplaces, brand-owned webstores, and offline channels while leveraging CastleGate's receiving, storage, picking, packing, and shipping capabilities.

CastleGate Multichannel Fulfillment is designed to give sellers one inventory pool that can serve multiple sales channels. Instead of separating inventory by marketplace or building parallel distribution streams, eligible SKUs held at CastleGate are available to be pulled for orders coming from supported external channels. That reduces duplicated safety stock, simplifies replenishment, and centralizes logistics operations under CastleGate's operational practices.

How The Service Works

Shipments arrive at the CastleGate facility and are received against merchant-provided purchase orders or ASN details. Inventory is logged into CastleGate's warehouse system and allocated to the merchant account. When an eligible order is created on an integrated channel, CastleGate pulls the order feed (via API, EDI, or SFTP), assigns a pick ticket, and moves the item through standard picking, packing, and carrier tendering workflows. Tracking and status updates are returned to the originating sales channel or the merchant's order management system.

Why Merchants Use It

Merchants choose CastleGate Multichannel Fulfillment to consolidate logistics, reduce handling complexity, and speed delivery without maintaining separate warehouses or multiple 3PL contracts. The service supports seasonal volume spikes, provides consistent packing standards, and typically integrates with common e-commerce platforms and marketplaces so that merchants can keep a single source of truth for available-to-promise inventory.

What The Service Typically Covers

• Receiving: Unloading, inspection, and put-away into CastleGate storage locations.
• Inventory Management: Cycle counts, SKU reconciliation, and reporting on available units for multichannel allocation.
• Order Processing: Picking, packing, and labeling according to channel requirements.
• Carrier Tendering: Access to negotiated carrier rates and multi-carrier options for parcel and freight.
• Returns Handling: Processed returns and disposition according to merchant policy.

How It Varies By Merchant And Channel

Not every SKU or sales channel will be eligible. Eligibility depends on contract terms, product restrictions (hazmat, oversized items), and integration capabilities between CastleGate and the sales channel. Some channels require branded packing or specific labeling that CastleGate may support as add-on services. Service levels—like cut-off times for same-day fulfillment, handling of multi-piece orders, and order consolidation—are defined in the merchant agreement.

Operational Considerations For Warehouses And Merchants

To use multichannel fulfillment effectively, merchants must standardize SKUs and barcoding, provide accurate product dimensions and weights, and agree on packaging rules. Warehouses must map channel-specific packing requirements into their WMS workflows, configure order routing rules, and establish exception handling for orders that fail validation. Integration points—APIs for orders and tracking, EDI for bulk data, or manual upload options—determine speed and automation level.

Practical Example

A furniture merchant stores a range of chairs at CastleGate. Orders arrive from the merchant's Shopify store, a regional marketplace, and a chain of retail partners. Instead of allocating separate pallets per channel, the merchant marks chairs as eligible for CastleGate Multichannel Fulfillment. When a Shopify order is placed, CastleGate picks and ships the item using the merchant's retail packaging preferences, while Marketplace orders use marketplace-compliant labels and packing. Inventory counts are decremented in a single ledger so the merchant avoids overselling and reduces total safety stock.

Common Fees And Billing Models

• Receiving Fees: Charged per inbound pallet or per carton depending on how stock arrives.
• Storage Fees: Monthly charges based on cubic or pallet location and time in storage.
• Pick And Pack Fees: Per-line or per-item charges for order processing, sometimes tiered by complexity.
• Carrier Fees: Carriers and postage are billed either at cost or at a negotiated rate plus a handling fee.

Tips For Getting Started

• Labeling: Ensure all cartons and pallets use standard barcodes readable by CastleGate's scanners.
• SKU Hygiene: Keep dimensions, weights, and descriptions accurate to avoid packing errors and rate mismatches.
• Integration Testing: Run pilot batches through your live channels to confirm order routing, tracking updates, and return flows work as expected.
• Service Agreement: Clarify cut-off times, SLA remedies for late shipments, and how exceptions are billed.

In short, the CastleGate Multichannel Fulfillment service centralizes inventory at CastleGate to serve orders from sales channels other than Wayfair, reducing duplicate inventory and simplifying multichannel operations while requiring clear SKU data, integration work, and agreed service levels.