Chce uzyc API od google Calender i uzywam tej dokumentacji:
https://developers.google.com/google-apps/c.../quickstart/php

Nie rozumie tego:

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define('APPLICATION_NAME', 'Google Calendar API PHP Quickstart');
define('CREDENTIALS_PATH', '~/.credentials/calendar-php-quickstart.json');
define('CLIENT_SECRET_PATH', __DIR__ . '/client_secret.json');
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Czym jest

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CREDENTIALS_PATH
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?
Wiem ze CLIENT_SECRET_PATH jest plikiem ktory zostal pobrany przy tworzeniu auth aplikacji.

Tutaj masz wyjaśnione:

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// Load previously authorized credentials from a file.
  $credentialsPath = expandHomeDirectory(CREDENTIALS_PATH);
  if (file_exists($credentialsPath)) {
    $accessToken = json_decode(file_get_contents($credentialsPath), true);
  } else {
    // Request authorization from the user.
    $authUrl = $client->createAuthUrl();
    printf("Open the following link in your browser:\n%s\n", $authUrl);
    print 'Enter verification code: ';
    $authCode = trim(fgets(STDIN));
 
    // Exchange authorization code for an access token.
    $accessToken = $client->fetchAccessTokenWithAuthCode($authCode);
 
    // Store the credentials to disk.
    if(!file_exists(dirname($credentialsPath))) {
      mkdir(dirname($credentialsPath), 0700, true);
    }
    file_put_contents($credentialsPath, json_encode($accessToken));
    printf("Credentials saved to %s\n", $credentialsPath);
  }
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W skrócie: "previously authorized credentials".

To to dzieki, lecz znalazlem lepsze i latwiejsze rozwiazanie.