How does one quantity sync across Amazon, Walmart and eBay?

My Business keeps one quantity for each product across every marketplace you sell it on. When it sells on one, the others are updated, so you don't sell stock you no longer have.

• Stock stored by FBA or Walmart Fulfillment Services is counted by the warehouse.
• A product you ship yourself and list on only one marketplace just follows that marketplace's count.
• Sync now in Inventory applies the latest sales right away.

If a marketplace refuses an update, Inventory shows how many listings are failing to sync. Open the product's row to read the marketplace's own reason.

End a listing everywhere

When you end a product's listing, you're asked whether to end it on every marketplace. The product stays in your inventory either way.

Syncing across marketplaces is part of My Business, on Pro.