Follow the below mentioned step to generate Walmart API keys from your Walmart Developer account.
Step 1: Open the link https://developer.walmart.com/#/home in your browser and click on Login link as shown in the below screenshot.
Step 2: A dialog box will open as shown below to choose country of your Walmart seller account.
Click on US or Canada flag under Marketplace Seller Login section.
Step 3: You will be redirected to the Walmart login page. Enter your Walmart login details and click on LOG IN in button.
Step 4: Now you will see your Walmart API keys as shown below screenshot. Copy Client ID and Client Secret from this page and input in to the app.
Step 5: Now to get your Walmart Open API Keys, Open the link https://developer.walmartlabs.com/member in your browser.
It will open a form as shown in below screenshot. Fill this form and click on Register button below.
Step 6:You will get an email with your Walmart Open API Key.
Use Client ID and Client Secret generated from Step 4 and Walmart Open API Key generated from Step 5 to connect your Walmart seller account.