Last Updated: Feb 24, 2026

This document outlines the steps to integrate the InfiPlex Inventory and Order Management System (OMS) with your Wayfair CastleGate Fulfillment account.

InfiPlex CastleGate Omni-Channel 3PL Fulfillment Integration

• Create a new Application within your Wayfair Partner Home account. Name the new application "InfiPlex - CastleGate" and set it to Production.
   
• Open a support ticket and inform Wayfair that you will be using InfiPlex as your Wayfair Solution Provider. In your support ticket, you must inform Wayfair Support that you want your Wayfair keys activated to access the CastleGate API for multi-channel dropship fulfillment. Wayfair Support will then activate the API Keys as Production keys, without the need to test.
   
• Send InfiPlex your keys:
  Send InfiPlex your Client ID and Secret keys to set up your Wayfair connection.
   

Add Retailers in the Wayfair Seller Portal

The CastleGate setup requires Retailer and Shipping entries to be created to push orders into CastleGate multi-channel shipments. The Retailer entry allows CastleGate to ship orders using the correct shipping carriers. This includes the ability to set up third-party shipping if your retailer requires it.

Go to the link below to start adding your Retailers.
https://partners.wayfair.com/d/multichannel-fulfillment/settings/retailers


 

• Retailer Information:
  Select one of the existing retailers from the Retailer Name drop-down. If your retailer does not exist, add the retailer name to the Custom Retail ID input box.
• Ship From Address:
  This address will be printed on the labels.
• Shipping Accounts:
  The default is to select "Use Wayfair's shipping account only". You can select "Add third-party shipping account(s)" for retailers that provide you with a carrier account to use for shipping.
• Speed Optimization:
  Select the recommended default, "Optimizing for Order to Delivery".
• Save the Retailer:
  Click the "Create Retailer" button on the bottom right of the page to save the retailer entry.

Once the Retailer has been added, it will show on the Multichannel Fulfillment settings page, as shown below.



Save Retailer ID:
Please send the Retailer Name and Retailer ID to InfiPlex Support. The Retailer ID is required to configure the CastleGate integration to include the correct Retailer ID when sending an order to CastleGate for shipment.

 

Multiple Warehouse Set-up with Wayfair CastleGate
CastleGate recommends that orders be sent to CastleGate without a specified warehouse. This allows Castlegate to determine the fastest, most efficient way to ship your order.

InfiPlex can be configured to mirror the Castlegate warehouses in a true multi-warehouse set-up. However, this does require billable support time to configure and manage. Please get in touch with InfiPlex Support to discuss this option and how it aligns with your retailer's requirements.