Walmart Marketplace sellers who rely on third-party apps should pay attention to the latestWalmart app connection changes. An upcoming deadline could affect apps used to manage orders, inventory, shipping, and other parts of their business. Walmart is retiring an older method that approved Solution Providers use to connect to seller accounts. The technology behind the change is mostly something solution providers need to worry about. For sellers, the important part is simpler:you may need to reconnect some Walmart Marketplace apps before October 1.