If you use your PayPal account for more than one business, you may want to use a unique checkout page style for each site you manage.
The code recipe below demonstrates how to set the
page_style parameter in your PayPal URLs. This will set the page style used for Paid Memberships Pro-based checkouts only (instead of using your PayPal account’s primary style).
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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.