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 drop-down menu under the Delegate Access section. Select “GeekSeller” as your solution provider.
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 right 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).