Render EventBrite iFrame on event page when EventBrite event is set to private

eventbrite-iframe.php

<?php
/*
 * For The Events Calendar and The Events Calendar: EventBrite Tickets
 * Renders the EventBrite iFrame on single event page when EventBrite event is set to private
 * Author: Barry Hughes
 */

function eb_iframe_show_even_if_private() {
    $post_id  = get_the_ID();
    $api = tribe( 'eventbrite.api' );
    $event = $api->get_event( $post_id );

    if ( ! $event ) {
        return;
    }

    $event_id = $event->id;

    $iframe_url = ( is_ssl() ? 'https://' : 'http://' ) . 'www.eventbrite.com/tickets-external?eid=%s&amp;ref=etckt&v=2';
    $iframe_url = apply_filters( 'tribe_events_eb_iframe_url', sprintf( $iframe_url, $event_id ) );

    $html = '';

    if (
        ! empty( $event_id ) &&
        $api->is_live( $post_id ) &&
        tribe_event_show_tickets( $post_id )
    ) {
        $html = sprintf(
            '<div class="eventbrite-ticket-embed" style="width:100%%;text-align:left">
                        <iframe id="eventbrite-tickets-%1$s" src="%2$s" style="height:200px;width:100%%;overflow:auto;"></iframe>
                        <div style="font-family:Helvetica, Arial;font-size:10px;padding:5px 0 5px;margin:2px;width:100%%;text-align:left">
                            <a target="_blank" href="http://www.eventbrite.com/features?ref=etckt" style="color:#ddd;text-decoration:none">Event registration</a>
                            <span style="color:#ddd"> powered by </span>
                            <a target="_blank" href="http://www.eventbrite.com?ref=etckt" style="color:#ddd;text-decoration:none">Eventbrite</a>
                        </div>
                    </div>', $event_id, $iframe_url );
    }

    $html = apply_filters( 'tribe_template_factory_debug', $html, 'Tribe__Events__Eventbrite__Template::the_tickets' );
    return apply_filters( 'tribe_events_eb_iframe_html', $html, $event_id, $post_id );
}

add_filter( 'tribe_events_eventbrite_the_tickets', 'eb_iframe_show_even_if_private' );