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I have an issue on redirecting the user to sign-in URL. When they click the "post comment" button, it should check first if the user is logged in to continue, and if not they are suppose to redirect on sign-in URL.
I add this code to functions.php file: using "wpdiscuz_before_comment_post" hook.
add_action("wpdiscuz_before_comment_post", function () {
  if ( ! is_user_logged_in() ) {
    wp_safe_redirect( 'https://vinhammer.com/sign-in/' );
    exit;
  }
});
but when I click the "Post Comment" button it doesn't redirect to sign-in page, instead the page shows inside a pop-out error message.
First of all the button works using the AJAX so the code you've written can't work. You should use the js code to get it to work as you like.Â
