MCS was launched by Walmart in September 2024. It is the primary fulfillment direction the app is built around.

How MCS works with this app

• A customer places an order on your Shopify store (or another connected channel)
• The app detects the order and matches it to a Sales Channel Config to determine the MCS Channel ID
• The app waits for Shopify to submit a fulfillment request (or, if auto-processing is enabled, proceeds immediately when payment is confirmed)
• The order is submitted to Walmart MCS with the customer's shipping address, items, and quantities
• Walmart picks, packs, and ships from your WFS inventory
• The app polls Walmart for shipping updates and writes the tracking number back to the Shopify order

MCS order lifecycle

• Status: What it means
• INITIATED: Order received by the app, awaiting fulfillment request
• RECEIVED: Submitted to Walmart MCS — Walmart has accepted it
• PROCESSING: Walmart is picking and packing
• SHIPPED: Order has left Walmart's warehouse, tracking available
• DELIVERED: Confirmed delivered
• CANCELLED: Order was cancelled before or after Walmart received it
• EXCEPTION: An error occurred — see Troubleshooting

Requirements for MCS to work

All of the following must be true for an order to be submitted to Walmart MCS successfully:

• Walmart account is connected with MCS API scope enabled
• MCS is enabled in Settings → Settings tab
• Every product in the order has a SKU mapping to a Walmart item
• The Walmart item is enrolled in WFS (visible in Catalog → Walmart Products → WFS Enabled column)
• A Channel ID is available — either from a matching channel config or from the global fallback
• Inventory is available at the Walmart Fulfillment Services Shopify location (requires inventory sync to be enabled)

Returns

When a customer returns an MCS order, the return is initiated at Walmart and the app syncs the return record back to Shopify. Auto-processing of returns can be toggled in Settings → Settings tab → Auto-process MCS returns.

What about Walmart.com orders?

MCS does not cover Walmart.com orders — those are handled by the WFS mode of the app. WFS and MCS can both be active at the same time.