When setting up Easyship Rates in your ChannelAdvisor store, there are some settings that need to be added.
Step 1: When logged into ChannelAdvisor, in the upper menu go to Sales > Shipping Carriers as per the image below. 
Step 2: Once in the Shipping Carriers settings, press Select All.
Add Easyship as a custom carrier at the bottom by filling out;
Carrier Name: Easyship
Carrier Class: Standard
Tracking URL Format: https://www.easyship.com/shipment-tracking/{0}
Click on ADD
Once done, CLICK SAVE
