\documentclass[
    fontsize=10pt,
    parskip=full,
    paper=A4,
    fromalign=off,
    fromphone=false,
    fromfax=false,
    fromemail=false,
    fromurl=false,
    foldmarks=true,
    version=last,
    refline=wide
]{scrlttr2}

% Layout
\usepackage{geometry}
\geometry{a4paper, left=20mm, right=0mm, top=20mm, bottom=17mm}

% Typography
\usepackage[utf8]{inputenc}
\usepackage{fontspec}
\usepackage{eurosym}
\usepackage[hidelinks]{hyperref}

\defaultfontfeatures{Mapping=tex-text}
\setsansfont[Scale=0.9]{Noto Sans Regular}
\setmainfont[SmallCapsFeatures={LetterSpace=5,Letters=SmallCaps}]{Noto Sans Regular}

% Language
\usepackage[ngerman]{babel}

% Table Customization
\usepackage{spreadtab}
\usepackage{arydshln}
\usepackage{hhline}
\usepackage{enumitem}
\renewcommand{\arraystretch}{1.5} % Apply vertical padding to table cells
% \usepackage[table]{xcolor}
% \definecolor{gr}{rgb}{0.95,0.95,1}

% Letterhead
$if(letterhead)$
    \usepackage{wallpaper}
    \ULCornerWallPaper{1}{$letterhead$}
$endif$

% \setplength{refwidth}{10cm}
% \setplength{refhpos}{0pt}
\setplength{locwidth}{6cm}
\setplength{locvpos}{6cm}

% \showfields{test}
\begin{document}

\date{}
\setkomavar{subject}[left]{\LARGE \textit{\textcolor{red}{$subject$}}}

% Additional Information
\setkomavar{location}{\raggedright
    $if(nr.invoice)$
        \small\textit{\textbf{RECHNUNG Nr.} $nr.invoice$}\\
        \scriptsize\textit{(Bitte bei Bezahlungen stets angeben)}
    $endif$

    $if(nr.shipping)$
        \small \textit{\textbf{LIEFERSCHEIN Nr.} $nr.shipping$}\\
    $endif$

    $if(nr.customer)$
        \small \textit{Kundennummer: $nr.customer$}\\
    $endif$

    $if(nr.order)$
        \small \textit{Bestellnummer: $nr.order$}\\
    $endif$

    $if(date)$
        \small \textit{Datum: $date$}
    $endif$
}

% Letter
\begin{letter}{
    \scriptsize{\textcolor{red}{Lieferadresse:}} \\

    $if(to.name)$
        $to.name$\\
    $endif$

    $if(to.address)$
        $for(to.address)$
            $to.address$\\
        $endfor$
    $endif$
}

\opening{}

% Table
% \footnotesize
\newcounter{pos}
\setcounter{pos}{0}
\STautoround*{2}
\STsetdecimalsep{,}

\begin{spreadtab}{{tabular}[t t t t t t t]{lp{7.6cm}rrrr}}
  \hdashline[1pt/1pt]
%   \rowcolor{red}
%   \rowcolor{gray!25}
%   \rowcolor{gr}
  @ \textbf{Pos.} & @ \textbf{Artikel} & @ \textbf{Art-Nr.} & @ \textbf{Menge} & @ \textbf{Einzelpreis} & @ \textbf{Gesamt} \\
  \hline
  $for(service)$
    @ \refstepcounter{pos} \thepos &
    @ $service.description$ &
    @ $service.nr$ &
    @ $service.count$ &
    :={$service.price.per_unit$} $currency$ &
    :={$service.price.total$} $currency$ \\
    \hline
  $endfor$
  @ \noalign{\vskip 1.2cm} & @ & @ & @ & @ & @\\
  $if(subtotal)$
    @ & @ & @ \multicolumn{3}{l}{\textbf{Zwischensumme:}} & :={$subtotal$} $currency$ \\
  $endif$
  $if(shipping)$
    @ & @ & @ \multicolumn{3}{l}{\textbf{Versandkosten:}} & :={$shipping$} $currency$ \\
  $endif$
  $if(VAT)$
    @ & @ & @ \multicolumn{3}{l}{\textbf{USt. $VAT.rate$\%}} & :={$VAT.amount$} $currency$ \\
    \noalign{\vskip 2mm} \hhline{~~----}
  $endif$
  \noalign{\vskip 2mm} & @ & @ \multicolumn{3}{l}{\textbf{Gesamtbetrag:}} & \textbf{:={$total$} $currency$} \\
  \noalign{\vskip 2mm}\hhline{~~----}
\end{spreadtab}
\vspace{15mm}

% \useplength{toaddrhpos}
% \useplength{refvpos}
% Body
$body$

% Closing
\end{letter}
\end{document}