Get a link to share if you want to share the store configuration page with the store owner:
Login to Walmart Seller Central, under API Integration (link), and click "API Key Management".
Then click "+ Add New Key For A Solution Provider" under "PRODUCTION KEYS". In the window that pops up, select any of the providers (QuickSKU isn't listed there yet), it doesn't matter
which one you pick. Click Next to select Permissions accordingly:
Get Feeds: ViewOnly
Item Management, Content: NoAccess, Items: ViewOnly, Inventory: FullAccess, Price: FullAccess
Order Management: Orders: FullAccess
Fulfillment: FullAccess
Settings,Rules&Admin: Reports: ViewOnly
Leave the rest as NoAccess
Click Submit and once it's saved copy/paste the Client ID and the Client Secret to the fields below and click Save.