Is there any way to find the URL to your customization spotlight entry, similar to how you can advertise your beauty contest entry? I've played around with the url a bit, but can never seem to find the corresponding one to my entries.
I don't believe there is. I know I've tried looking for it a couple times (and I just looked again now).
You can only load a url + formdata directly when the code behind it uses $_GET['html-formvalue'] if the code uses $_POST['html-formvalue'] you wont be able to load it directly through a url