Developer Apis and Code examples

Developers can go through Google Api Client documentation to better understand the code.  Considering the example from the configuration page.

Developers needs to create a new event on user's google calendar, on create of the fundraiser event developer can execute some code to retrieve a list of donors who are subscribed and loop, in our case we have only one account which is authenticated/subscribed.

// User properties to search gauth_user entity
$properties = [
  'google_api_account' => GOOGLE_API_CLIENT_ID, // ID for Google Calendar on admin/config/services/google_api_client
  'uid' => \Drupal::currentUser()->id(), // Assuming current user
];

// Load the account
$google_api_client = \Drupal::entityTypeManager()->getStorage('gauth_user')->loadByProperties($properties);
if (empty($google_api_client)) {
  return;
}
$google_api_client = array_values($google_api_client)[0];
// Get the service.
$googleService = \Drupal::service('google_api_client.client');

// Apply the account to the service
$googleService->setGoogleApiClient($google_api_client);

// Try your API Operations.
try {
  // Fetch calendar object.
  $object = $googleService->getServiceObjects();
  // $object['calendar'] is a object of Google_Service_Calendar

  // Retrieve default calendar id of user (check calendar id field we created)
  $calendar_id = $google_api_client->get('field_calendar_id')->getValue();
  if (empty($calendar_id)) {
    // No calendar entry found so we create new.
    $calendar = new \Google_Service_Calendar_Calendar();
    // Title
    $calendar->setSummary('ABC Fundraiser events');
    $new_calendar = $object['calendar']->calendars->insert($calendar);
    $calendar_id = $new_calendar->getId();
    $google_api_client->set('field_calendar_id', $calendar_id);
    $google_api_client->save();
  }
  else {
    $calendar_id = $calendar_id[0]['value'];
  }

  // Build event params.
  $event = new \Google_Service_Calendar_Event();
  // Start Date
  $start_date = new \Google_Service_Calendar_EventDateTime();
  $start_date->setDateTime(date('Y-m-d\TH:i:s', strtotime('25 december 2020 10 am')));
  $start_date->setTimeZone(drupal_get_user_timezone());

  // End Date
  $end_date = new \Google_Service_Calendar_EventDateTime();
  $end_date->setDateTime(date('Y-m-d\TH:i:s', strtotime('25 december 2020 10 pm')));
  $end_date->setTimeZone(drupal_get_user_timezone());

  $event->setStart($start_date);
  $event->setEnd($end_date);
  $event->setSummary('Christmas fundraiser');


  // Create event on calendar
  $event = $object['calendar']->events->insert($calendar_id, $event);
}
catch (Exception $e) {

  // ksm($e);
}

Above code creates a  ABC Fundraiser events calendar for every subscriber and if calendar exists then it creates a new event for Christmas fundraiser.