Before you process order shipments for Walmart Marketplace orders, map Walmart preferred shipping carriers to the corresponding carrier in Commerce so that the shipping data can be synchronized between Walmart and Commerce.
Commerce carriers that do not map to a preferred carrier are labeled as Other Carrier on Walmart.
Review Walmart Requirements for the Marketplace Seller account.
On the Listings page for the sales channel store, select Channel Settings.
On Channel Settings, select Walmart Connection.
To modify the credentials, select Change Credentials
Enter the Walmart Client ID and Walmart Client Secret.
Select Save to apply the configuration.