Adding 'sendUpdates' => 'all' to Google Calendar API (PHP)

Question

I am trying to modify the below code to add 'sendUpdated' => 'all' so all the attendees receive the email when the event is created or updated.

<?php
// Exit if accessed directly.
defined( 'ABSPATH' ) || exit;

/**
 * Google Calendar Synchronization.
 */
class WC_Appointments_GCal {

    const TOKEN_TRANSIENT_TIME = 3500;

    const DAYS_OF_WEEK = array(
        1 => 'monday',
        2 => 'tuesday',
        3 => 'wednesday',
        4 => 'thursday',
        5 => 'friday',
        6 => 'saturday',
        7 => 'sunday',
    );



.......full code can be found below...

Full code: https://pastebin.com/PLEwYTZV

(Above code does not belong to me and the reason it is external, because I am not able to paste everything here due to the limit.)

API Documentation: https://developers.google.com/calendar/v3/reference/events/

Answer 1

Had to add this to complete the url

$api_url = $api_url_ok.'/?sendUpdates=all';