Can't get "pay-per-post" plugin working on Divi theme

I was able to get this plugin working on a test site (bananahandles.jfwebdev.com). But now that I'm moving to the actual site I want to use (dev.americabeheard.com), it is not working.

Here are two pages I've got it setup on that it doesn't seem to function:

With Gravity Forms:
http://dev.americabeheard.com/submit-2-gf-paid/

With WP User Front End Pro
http://dev.americabeheard.com/submit-a-video-wpu-paid/

Any idea what's going on here?