To connect your Walmart account to Link My Books you'll need to grant us access using the Walmart Developer Portal.
Navigate to developer.walmart.com and click My Account, then select Marketplace (US & Mexico)
Click the + Add New Key For A Solution Provider button
Select Link My Books from the Select Solution Provider dropdown, then click Next
On the Link My books Key Permission page, select View Only for Reports from the Settings, Rules & Admin section and click Submit
A success message will appear showing Added Link My Books
Copy the provided Client ID and Client Secret and paste them into your Link My Books account.