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Walmart Fulfillment Services (WFS)
Walmart Seller app
The app can only be used to manage your U.S. Marketplace business and doesn’t support the management of Marketplace business in Canada, Mexico or Chile. The Walmart Seller app is available from the iOS App Store and Google Play store across all countries except China, Canada, Mexico, Chile and countries subject to OFAC (Office of Foreign Assets Control) sanctions.
Follow these instructions below to issue a refund via the mobile app.
Tap Menu and navigate to the Returns page.Â
Go to the Initiated  tab to select a return request and browse Return details. Â
On Return Details, tap Issue refund.   Â
You’ll receive a Refund will be issued confirmation.  
To learn how to issue an adjustment, visit Issue a standard refund in Seller Center.