This article is the first in a series of customizations for running tests to optimize your membership checkout process. It’s also useful for sites that want to highly customize the appearance of the checkout page for each level.
The code allows you to specify a different template for the output of the Membership Checkout page. Just include the shortcode on every checkout page, and the code will swap in the specified custom template.

The Code Recipe
Adding the Recipe to Your Website
You can add this recipe to your site by creating a custom plugin or using the Code Snippets plugin available for free in the WordPress repository. Read this companion article for step-by-step directions on either method.