redirect to iOS app with query string or custom path

Either one should be ok. The first example is more straightforward, but not 100% necessary.

If you do either, I just suggest making them relative to the root folder, so the redirect URL would be /invite/invitecode/and the destination URL would be app_name://invitecode/.

If ‘app_name://’ is not a standard protocol, then you may need to add a filter to add the app_name protocols to the allowed protocols, so that the plugin does not strip them for being not allowed.

Let me know if you need a hand with that.
Warmest regards,
Don

The filter would only be needed if you were adding the redirects via the plugin.

For completeness and if you did use the plugin and wanted to add a filter, it would be something like this (added to the theme’s function.php file after the <?php tag):

add_filter('qppr_allowed_protocols','custom_qppr_allowed_protocols');
function custom_qppr_allowed_protocols($allowed){
     $allowed[] = 'app_name';
     return $allowed;
}

This would allow you to add redirects with the app_name:// protocol otherwise it would give you an error saying it is not allowed.

Warmest regards,
Don