Volume Discount for EE3 with No Info Required on Additional Attendees

gistfile1.txt

add_action('action_hook_espresso_save_attendee_data', 'apply_volume_discount_hook_function');

function apply_volume_discount_hook_function ( $attendee_data ) {
	if ( !empty($attendee_data['event_meta']['VD_threshold']) &&
			!empty($attendee_data['event_meta']['VD_discount']) &&
			(int)$attendee_data['quantity'] >= (int)$attendee_data['event_meta']['VD_threshold'] ) {
		global $wpdb;
		$data = array( 
			'final_price' => max(array( 0, (float)$attendee_data['final_price'] - (float)$attendee_data['event_meta']['VD_discount'] ))
				);
		$where = array(
			'id' => absint( $attendee_data['attendee_id'] )
				);
		$format = array(
			'%f'
				);
		$where_format = array(
			'%d'
				);
		$wpdb->update( EVENTS_ATTENDEE_TABLE, $data, $where, $format, $where_format );
	}
}