Invite GeekSeller to your Walmart account
First, go to https://developer.walmart.com/#/delegateAccess and log in with your Walmart Seller Center credentials.
Next, look for a Production Keys for Solution Providers section – it’s located below Production Keys. Select “GeekSeller” as your solution provider.
Click EDIT, so you can adjust access options.
Give GeekSeller Full Access
If the options are limited to “No Access” or “View Only”, select View Only.
Select Full Access if all options are visible.
Generate API Keys
On the left side of the table in the GeekSeller row, click the “API Key” link to generate your API credentials. Finally, enter them in your GeekSeller account at GeekSeller Walmart panel > Settings > oAuth API Credentials (New).