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\section{Deposit} \label{sec:deposit}
\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{Retail bank \\
\\ \begin{tikzpicture}
\node [fill=gray!20,draw=black,thick,align=center] {Checking \\ Accounts};
\end{tikzpicture}
}}
\postlevel
\begin{callself}{wallet}{Review deposit fees}{}
\end{callself}
\mess[0]{wallet}{Deposit {(Coins)}}{exchange}
\begin{sdblock}{Acceptable account?}{}
\mess[0]{exchange}{{Refuse deposit}}{wallet}
\end{sdblock}
\begin{sdblock}{KYC/AML required?}{}
\begin{callself}{exchange}{Figures~\ref{fig:proc:kyc}, \ref{fig:proc:aml}}{}
\end{callself}
\end{sdblock}
% \prelevel
% \prelevel
% \begin{sdblock}{User abort?}{}
% \mess[0]{wallet}{{Request abort}}{exchange}
% \mess[0]{exchange}{{Abort confirmation}}{wallet}
% \end{sdblock}
\mess[0]{exchange}{{Initiate transfer}}{bank}
\end{sequencediagram}
\caption{A customer deposits the coins issued by a Taler exchange (payment
service provider) into a bank account. Even if the
bank account is owned by the same customer, the
KYC checks from Section~\ref{sec:kyc:deposit} apply.}
\label{fig:int:deposit}
\end{figure}
We do {\bf not} permit the customer to regain control over their funds {\em
unless} they pass the KYC/AML checks. The technical reason is simply that
the KYC/AML checks happen {\em after} the aggregation logic and at this point
refunds are no longer permitted. From a compliance perspective, this also
prevents malicious customers from risk-free probing of the system.
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