I have a price rule attached to the flat rate shipping method as an option, and I want to intercept when the coupon is added, so that I can hide this flat rate method unless the coupon code matches the code value in the option. I have a model setup for retrieving the coupon code that is attached to the shipping method, but I don’t know how to hide, show and auto select a shipping method once I compare the coupon codes.
For example, I am not sure if it is possible to do what I want when I override MagentoCheckoutControllerCartCouponPost.
