Why is the discount code not appearing on the checkout page?
One of the main reasons why this happens is there are other apps running in the background that might not be compatible to work with our app. Once you have created your offer, it should automatically appear on the cart page and then on the checkout page as long as the requirements are met by the customer. If this does not happen, it could be caused by app incompatibility.
What should I do to make the discount codes appear?
These apps need to be uninstalled for Discounted Pricing to work properly.