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\section{AML process}
\begin{figure}[h!]
\begin{sequencediagram}
\newinst{wallet}{\shortstack{Customer \\
\\ \begin{tikzpicture}
\node [fill=gray!20,draw=black,thick,align=center] { Unique \\ Action};
\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]{staff}{\shortstack{AML staff \\
\\ \begin{tikzpicture}
\node [fill=gray!20,draw=black,thick,align=center] { Access \\ Token};
\end{tikzpicture}
}}
\postlevel
\mess[0]{wallet}{{Initial action}}{exchange}
\begin{callself}{exchange}{Establish AML requirement}{}
\end{callself}
\begin{callself}{exchange}{Queue AML task}{}
\end{callself}
\mess[0]{exchange}{Wait for AML}{wallet}
\mess[0]{staff}{Request AML work}{exchange}
\mess[0]{exchange}{{Open AML task(s)}}{staff}
\mess[0]{staff}{Request details}{exchange}
\mess[0]{exchange}{KYC/AML data}{staff}
\begin{callself}{staff}{Review and decide}{}
\end{callself}
\mess[0]{staff}{{Decision documentation}}{exchange}
\mess[0]{exchange}{AML decision}{wallet}
\mess[0]{wallet}{{Retry action}}{exchange}
\end{sequencediagram}
\caption{Deposit interactions between customer, Taler exchange (payment
service provider) and the AML staff. The process can be
triggered by various {\em actions} described in Chapter~\ref{chap:triggers}.
AML staff interactions are cryptographically secured and
decisions and the provided reasoning are archived by the exchange.
AML staff may interact with the customer (out-of-band)
in its decision process.
}
\label{fig:proc:aml}
\end{figure}
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