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\section{Withdraw}
\begin{figure}[h!]
\begin{sequencediagram}
\newinst{wallet}{\shortstack{Customer wallet \\
\\ \begin{tikzpicture}
\node [fill=gray!20,draw=black,thick,align=center] { Unique \\ Wallet ID};
\end{tikzpicture}
}}
\newinst[2]{exchange}{\shortstack{Taler (exchange) \\
\\ \begin{tikzpicture}[shape aspect=.5]
\tikzset{every node/.style={cylinder,shape border rotate=90, draw,fill=gray!25}}
\node at (1.5,0) {\shortstack{{{\tiny Database}}}};
\end{tikzpicture}
}}
\newinst[2]{bank}{\shortstack{Customer bank \\
\\ \begin{tikzpicture}
\node [fill=gray!20,draw=black,thick,align=center] {Checking \\ Accounts};
\end{tikzpicture}
}}
\postlevel
\mess[0]{wallet}{Withdraw {(Amount)}}{exchange}
\mess[0]{exchange}{{Configuration (ToS, Fees)}}{wallet}
\begin{sdblock}{once}{}
\begin{callself}{wallet}{Accept ToS}{}
\end{callself}
\end{sdblock}
\begin{callself}{wallet}{Review withdraw fees}{}
\end{callself}
\mess[0]{wallet}{{Initiate transfer (Amount, Credit account, Wallet ID)}}{bank}
\mess[0]{bank}{{Credit (Wallet ID)}}{exchange}
\begin{sdblock}{Acceptable transfer?}{}
\mess[0]{exchange}{{Bounce funds}}{bank}
\end{sdblock}
\postlevel
\mess[0]{exchange}{Confirm wire transfer}{wallet}
\mess[0]{wallet}{Request digital cash}{exchange}
\mess[0]{exchange}{Distribute digital cash}{wallet}
\postlevel
\begin{sdblock}{Withdraw period expired?}{}
\mess[0]{exchange}{{Return remaining funds}}{bank}
\end{sdblock}
\end{sequencediagram}
\caption{Withdraw interactions between customer, Taler exchange (payment
service provider) and bank. The amount of digital cash distributed is
subject to limits per origin account (see Figure~\ref{fig:kyc:withdraw}).}
\label{fig:int:withdraw}
\end{figure}
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