protected function _getPaymentId()
    {
        /** @var OxpsPaymorrowOxBasket|oxBasket $this */

        $sId = (string) $this->getPaymentId();

        if ( !empty( $sId ) ) {
            $sId = $this->_toUtf( $sId );
        } else {
            $sId = 'PaymentId';
        }

        return $sId;
    }