In LiveWhale 2.x and before this was called PUBLIC_THANKS_URL. That name is still supported in 3.0 for backwards compatibility, but the new name is SUBMISSION_THANKS_URL.
Set default url for submission thank you page (default: /details/submit_thanks.php)
Accepted values: string (url)
Context: Front-end (client/public.config.php)
In LiveWhale 2.x and before this was called PUBLIC_THANKS_URL. That name is still supported in 3.0 for backwards compatibility, but the new name is SUBMISSION_THANKS_URL.