Hey,
SEF url shouldn't have any effect on this url. At least the Joomla standard one? Are you using any 3rd party SEF component?

Hi Daniel,

I am actually not using any third party SEF components. I also must apologize, as I did not clarify whether I was talking about the component or the module. The CMC component works absolutely fine. The module also works perfectly fine with SEF turned OFF. The issue is when SEF is ON that it seems to have trouble passing the URL to Mailchimp.

The only thing that I have customized in my htaccess file is: RewriteCond %{REQUEST_URI} ^/index\.php/ and RewriteRule ^index.php/(.*) /$1 [R=301,L], but I have tested the module without them and still no luck.

Do you believe that the problem is with my htaccess configuration? I will try to debug a bit more and see what I can find. Any suggestions you might have would be greatly appreciated. Other than that, your script is a huge time-saver. Great work!

The thing is. If you have SEF on and you pass a non-sef url - it should work.
The server is making some magic to redirect SEF urls to the index.php file. In the case of a non-sef url you are directly accessing the index.php file and then you shouldn't have any issues.
What's exactly the error you get when you access the webhook url?

Regards,
Daniel