Follow the below mentioned step to generate Walmart API keys from your Walmart Developer account.

Step 1: Open the link 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 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.

Walmart Importer - How to link Walmart Seller Account