private function translateRow(&$row)
    {
        $new_row = [];

        // Translate incoming data via mapping array.
        foreach ($row as $key => $value) {
            if (array_has($this->config['mapping'], $key)) {
                $new_row[array_get($this->config['mapping'], $key)] = $value;
            }
        }

        // Replace with translated row.
        $row = $new_row;
    }