Import extra fields from Z-Tickets object ( productions, shows ) to Theater object ( events, event dates ).

ztickets_import_extra_fields.php

<?php
/**
 * Imports extra fields from Z-Tickets object ( productions, shows ) to Theater object ( events, event dates ).
 * 
 * @param 	WPT_Production|WPT_Event 	$theater_object
 * @param 	object						$ztickets_object
 * @return 	void
 */
function ztickets_import_extra_fields( $theater_object, $ztickets_object ) {
	
	$extra_fields = array( 'released', 'maccsbox_code' );
	
	foreach( $extra_fields as $field ) {

		if ( !property_exists( $ztickets_object, $field) ) {
			continue;
		}
		
		update_post_meta( $theater_object->ID, $field, $ztickets_object->{ $field } );
		
	}
	
}
add_action( 'theater/ztickets/import/process/production', 'ztickets_import_extra_fields', 10, 2 );
add_action( 'theater/ztickets/import/process/event', 'ztickets_import_extra_fields', 10, 2 );