Salesforce: Shipping Promotions
All types of Shipping method promotions can be set up and used in Katalys Plugin but the following steps should be taken to make sure that promotions are set properly.
Set up a promotion at Merchant Tools > Online Marketing > Promotions
Make sure to select shipping class.
After setting up the shipping class make sure to assign a campaign to the promotions.
Navigate to Merchant Tools > Site Preferences > Custom Site Preference Groups > Katalys > Katalys Free Shipping Methods, and fill in the ids of shipping methods you want the promotion to affect separated by a comma.