No, I mentioned the user regsitration because I'm also trying to figure out why it's not working on the PayPal Pro Registration Forms as well. As I get this issue when trying to pull contents via SSL:
I went through and made a test template page for SSL testing and I may have found the culprit for the error: Errors when trying to pull from urls with
https://...
Notice: file_get_contents() [function.file-get-contents]: Unable to find the wrapper "https" - did you forget to enable it when you configured PHP? in /home/managed/public_html/test/wp-content/themes/cityguide/template-ssltest.php on line 11
I'm thinking it has something to do with SSL interaction with PayPal Pro itself, almost as if I'm not even connecting to PayPal at all when making these transactions because openssl isn't enabled.
I'm going to run some more tests , enable SSL , cURL as well and get back with what I come up with!