When a customer add a coupon to his/her cart, it’s nice and best practice to show to him/her if the coupon has been applied successfully, or if it was an invalid/not applicable code.
How can you do that?
In old promotion system
When old promotion system run, each successfully applied promotion will be presented by an instance of Discount, which has a property named DiscountCode – this is the coupon used for the promotion (it can of course be null if the promotion requires no coupon).
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