title: Google Spreadsheet API issue
body: <p>I am getting the following error:</p>
  
  <pre><code>Uncaught exception 'Google_Service_Exception' with message 
  { "error": { "code": 403, "message": "The request is missing a valid API key.", 
  "errors": [ { "message": "The request is missing a valid API key.", "domain": "global", 
  "reason": "forbidden" } ], 
  "status": "PERMISSION_DENIED" } 
  }
  </code></pre>
  
  <p>My code is:</p>
  
  <pre><code>$client = new Google_Client();
  $client-&gt;setAuthConfig('google-api-php-client-2.1.1/client_s‌​ecret.json');
  $client-&gt;addScope(Google_Service_Drive::DRIVE);
  $client-&gt;setRedirectUri($redirect_uri);
  $spreadsheetId = '1Ybwc_wNhvc6tVQIRY-33qwkY0WoGj09uIQ3YQqa9fvo';
  $range = 'sample!A2:E'; $response = $service-&gt;spreadsheets_values-&gt;get($spreadsheetId, $range);
  $values = $response-&gt;getValues();
  if (count($values) == 0) {
      print "No data found.\n";
  } else {
      print "Name, Major:\n";
      foreach ($values as $row) {
            printf("%s, %s\n", $row[0], $row[4]);
      }
  }
  </code></pre>
  
  <p>Can anyone help/guide me in find the cause of the issue?</p>