How to create a private link with Prevent direct accecs WordPress Plugin

create_private_link.php

<?php
if ( class_exists( 'PDA_Private_Link_Services' ) ) {
    //669 is attachment's id.
    return PDA_Private_Link_Services::create_private_link( 669, array(
      'expired_days'    => 5,
      'limit_downloads' => 3,
    ) );
}