- Installation instructions can be found here
In admin panel under System->Configuration->Sales->”Checkout totals sort order” change Discount to be 30 and Shipping to be 20. Save config. This is required to ensure shipping is calculated prior to discount
Within Promotions->Shopping Cart Price Rules under the Actions tab you should be able to see 2 new Apply options for Percent and Fixed shipping price discount
Promotion Rule Configuration
- Under Promotions->Shopping Cart Price Rules add a new rule
- Enter rule information
Under Conditions add criteria, plus if you want a particular shipping method then select it from list
In Actions select Percent/Fixed shipping price discount and set discount amount
Set the Description to what you wish to display to customer on frontend
- Save Rule & Test
On the Frontend the customer will not immediately see the discount applied because it works off shipping rather than the cart total. Until shipping is calculated the discount cannot be applied. It's recommended that the Cart Shipping Estimator is left in so that customers get some visibility of the shipping promotion.
The discount is only applied if the customer selects the appropriate shipping method - Ground in this instance. On updating the total then the discount is applied.
The discount will not be more than the cart subtotal.