To connect Sales Channels to Walmart USA, you need to get Walmart API credentials and set permissions:

1. Log in to your Walmart Developer Portal.

2. Click + Add New Key For A Solution Provider.

3. Select Sales Channels in the dropdown and click Next.

4. Specify the permissions you want to grant Sales Channels access to.

Grant the app Full Access permissions where possible for a more efficient work.

5. Click Submit.

Once done, copy and paste the generated Client ID and Client Secret in Sales Channels > Settings > Walmart.

Anytime you can Reset your API Keys in the Walmart Developer Portal to re-authorize the app.