You'll need to log in as the admin of your Walmart seller account. Only the admin can approve the connection.
Steps
Go to Manage Stores & Files and click "+ Add Store" at the top right (or the "Add Stores" tile if you have no stores yet).
Click Connect on the Walmart box.
Type a Store Name. This is the store's name in ConnectBooks, so pick one you'll recognize.
Do you use Walmart Fulfillment Services (WFS)? If so, turn on "I use WFS". We'll then bring in your WFS inbound shipments.
Click Connect.
Walmart opens. Log in and approve sharing your data with ConnectBooks.
You'll come back to ConnectBooks, and a window asks if you want to connect Walmart Ads. To bring in your ad costs, turn on API access for ConnectBooks in Walmart, type your Advertiser ID, and click Connect. Don't run ads? Click Skip.
That's it. ConnectBooks starts bringing in your Walmart data.
Frequently asked questions
It says the store name already exists.
Each store needs its own name. Pick a different one.
I skipped Walmart Ads. Can I add them later?
Can I turn WFS on or off later?
Yes, in the store's settings.