Google Service Exception

<?php
    require_once __DIR__ . '/vendor/autoload.php';
    
    $client = new Google_Client();
    $client->setApplicationName('Google Calendar API PHP Quickstart');
    $client->setAuthConfig(__DIR__ . '/client_secret.json');
    
    $calendar = new Google_Service_Calendar($client);
    
    $events = $calendar->events->listEvents('apdcompany.test@gmail.com');
    
    print_variable($events, 'Google Calendar Events');
    
    
function print_variable($var, $label, $raw = true){

    echo '<br>=========START=========<br>';
    echo '<b>' . $label . '</b>';

    if ($raw == true) echo '<pre>';

    print_r($var);

    if ($raw == true) echo '</pre>';
    echo '<br>=========END=========<br>';
}
?>

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PHP Fatal error:  Uncaught Google_Service_Exception: {
 "error": {
  "errors": [
   {
    "domain": "usageLimits",
    "reason": "dailyLimitExceededUnreg",
    "message": "Daily Limit for Unauthenticated Use Exceeded. Continued use requires signup.",
    "extendedHelp": "https://code.google.com/apis/console"
   }
  ],
  "code": 403,
  "message": "Daily Limit for Unauthenticated Use Exceeded. Continued use requires signup."
 }
}
 in C:\inetpub\wwwroot\test\gmail_calendar\vendor\google\apiclient\src\Google\Http\REST.php:118
Stack trace:
#0 C:\inetpub\wwwroot\test\gmail_calendar\vendor\google\apiclient\src\Google\Http\REST.php(94): Google_Http_REST::decodeHttpResponse(Object(GuzzleHttp\Psr7\Response), Object(GuzzleHttp\Psr7\Request), 'Google_Service_...')
#1 C:\inetpub\wwwroot\test\gmail_calendar\vendor\google\apiclient\src\Google\Task\Runner.php(181): Google_Http_REST::doExecute(Object(GuzzleHttp\Client), Object(GuzzleHttp\Psr7\Request), 'Google_Service_...')
#2 C:\inetpub\wwwroot\test\gmail_calendar\vendor\google\apiclient\src\ in C:\inetpub\wwwroot\test\gmail_calendar\vendor\google\apiclient\src\Google\Http\REST.php on line 118

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