In the connections tab, click Add sales channel
In the Add Sales Channel window, choose Walmart as your store type and click continue
Unify will then ask you to enter your Walmart details. Please enter these and click continue. To learn how to get these credentials click here or scroll to the bottom of this page.
As soon as your store is connected, Unify will begin downloading orders from the last 30 days. You may change this setting later under Order Settings.
How to get the Walmart credentials:
Login to your Walmart account on the Walmart website and click on the settings gear icon. Then click on consumer id's and private keys under API.
Once done with the above, Copy the consumer id and the channel type (the bold data indicated in the picture). Then Regenerate and copy the private key. Use these to connect to your Walmart store.