code: protected function createAccess()
      {
          $xml = new DOMDocument();
          $xml->formatOutput = true;
  
          // Create the AccessRequest element
          $accessRequest = $xml->appendChild($xml->createElement('AccessRequest'));
          $accessRequest->setAttribute('xml:lang', 'en-US');
  
          $accessRequest->appendChild($xml->createElement('AccessLicenseNumber', $this->accessKey));
          $accessRequest->appendChild($xml->createElement('UserId', $this->userId));
          
          $p = $accessRequest->appendChild($xml->createElement('Password'));
          $p->appendChild($xml->createTextNode($this->password));
  
          return $xml->saveXML();
      }
docs: Create the access request.
  
  @return string