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Walmart Fulfillment Services (WFS)
If you self-fulfill your Marketplace orders, you can purchase multiple discounted shipping labels directly in Seller Center in bulk. For more information on how to buy shipping resources at competitively discounted rates using Walmart APIs, visit the Developer Portal. In this guide, you’ll learn how to start the process of buying shipping labels in bulk.
API support is available for USPS, FedEx and Yanwen. UPS isn't supported.Â
Buying shipping labels in bulk 
Step 1 — Get started
Navigate to the Orders dashboard in Seller Center. Eligible orders will appear in the Unshipped tab. Select the checkboxes next to the Purchase Order (PO) numbers and select Process orders.  
You can buy shipping labels for seller-fulfilled orders only.Â
Step 2 — Choose your shipping label preferencesÂ
Complete the required information for each row and select the Update  button to retrieve information and pricing to generate your shipping label. Â
To ship from the China fulfillment center, change the Ship from field for items shipping from China FC. Provide the required information in Mandarin for Item description and Ship from address. Then, choose the item that contains the checkbox to accurately state the contents in the package.    Â
For some POs, this information may already have been pre-filled based on previously selected defaults. You can keep such rows as is or change the values.Â
Step 3 — Complete label purchase Â
Then, select all the rows that you want to proceed buying labels for and select the Buy Shipping  button to complete the label purchase.  To purchase labels for unselected rows, you’ll need to restart the process and reselect them from the Orders dashboard.  Â
After your labels have been purchased and generated, select the Print labels button to retrieve the label. After you’ve printed your label and are ready to ship, select the Mark as Shipped  button. Once you mark the order as shipped, the label can’t be canceled or modified. Â
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Access to preferred carrier rates for eligible shipments are subject to this program’s Terms of Service. You can only purchase shipping labels in Bulk through Walmart for orders that are in an unshipped status.