Check the source code for hidden discounts If this sounds too complicated don't panic it's quite simple. When you're on the checkout part of the website, if there is a box to enter a discount code this is where you should inspect the source code of the site. To do this right click on the page and then select inspect.

You can add a discount to the checkout by adding discount=CODE to the end of your cart permalink. For example, if you have a discount code titled 15off , then add discount=15off to the end of the link. The discount is applied when a customer checks out using the link.