Desktop
In a desktop browser, you will find the "Add discount" option in the left-hand side of the checkout window.
Mobile
In a mobile browser, first click on the "Show order summary" option, and then you will find the "Add discount" option appear.
In a desktop browser, you will find the "Add discount" option in the left-hand side of the checkout window.
In a mobile browser, first click on the "Show order summary" option, and then you will find the "Add discount" option appear.