public function hasParam($paramName) {
    if (isset($this->paramFields[$paramName])) {
      return true;
    }
    elseif ('sourceId' === $paramName) {
      return true;
    } //default field due to support issues
    elseif ('userAgent' === $paramName) {
      return true;
    } //default field due to support issues
    elseif ('orderId' === $paramName) {
      return true;
    } //default field due to support issues
    elseif ('customerId' === $paramName) {
      return true;
    } //default field due to support issues
    return false;
  }