I have a customer told me the discount code is not applied to the total amount. However after I checked and checked, the problem is it doesn't look like it applied.
Before the discount is applied, sub-total of individual product display the regular price
After the discount is applied, sub-total of individual product display the discounted price
However not a lot people remember the regular price, they don't realize it is a discounted price by looking at this checkout page, even I was confused for a day.
My question is how can I display the regular price of individual product after the discount code is applied. This way, costumers can still see the regular price of each product and the sum price of their purchasing with discount applied.