While connecting SellerChamp with your Walmart account, we require you to enter the Client ID and the Client Secret from your Walmart's Developmental Portal page by clicking on the Click here option in the settings page.
This will bring you to a page where you will be required to login to Walmart by using the same credentials to login to your Walmart seller central.
You will try to login, but it will fail and here is why:
Your Walmart account is still using the old API settings (Consumer ID / Private Key) instead of the new authentication mechanism (Client ID / Client Secret).
Therefore, you will have to contact Walmart Support and ask them to upgrade your Walmart account.