Unable to make this work - Pay Per View

Hi - I've installed the plugin in Wordpress (I'm using the latest version) as per the instructions however I'm unable to make it work. I have a third party theme and it uses custom post types, so I thought that perhaps I needed to use the 'Customization' code, so I tried this however I'm unable to make it work.

I have attached the posts template for my custom post type, called 'single-workout.php' which is stored in inshape-child

I have attached the 'functions.php' file that is stored in inshape-child

I've attached a screenshot called Post Preview, this shows the resulting posts page.

And I've attached a screenshot of the post editing page called Post Screenshot for an example of where I've used the shortcode.

Can you please take a look?