Sometimes having a discount code field on your checkout page can cause you to lose sales. A user that would have otherwise paid full price may see that field and go off on a search for “company x discount codes.”
This code recipe will hide the field from the checkout page and only display it if the code is passed through the URL in the format
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Author: Jason Coleman
Jason is co-founder of Paid Memberships Pro, the 100% open source membership plugin for WordPress. He has been pushing WordPress to its limits for many years and is an advocate for using WordPress as an application framework to build web sites and apps that go above and beyond the typical blog of CMS site.