The filter can be used if it’s needed to change the content while sending the subscription confirmation email.
Changelog
Since 7.6.1 version
Parameters
1. $message – the content of the subscription confirmation email
2. $postId – the ID of the current post
3. $email – the email where the confirmation email is sent
Usage
add_filter('wpdiscuz_confirm_email_content', function($message, $postId, $email){
return 'My Custom Content';
}, 10, 3);