2023-07-02 16:09:09 +02:00
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\section{Pay} \label{sec:pay}
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2023-05-07 17:52:46 +02:00
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\begin{figure}[h!]
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\begin{sequencediagram}
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\newinst{wallet}{\shortstack{Customer wallet \\
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\\ \begin{tikzpicture}
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\node [fill=gray!20,draw=black,thick,align=center] { Unique \\ Wallet ID};
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\end{tikzpicture}
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}}
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\newinst[1]{merchant}{\shortstack{Merchant \\
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\\ \begin{tikzpicture}[shape aspect=.5]
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\tikzset{every node/.style={cylinder,shape border rotate=90, draw,fill=gray!25}}
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\node at (1.5,0) {\shortstack{{{\tiny Database}}}};
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\end{tikzpicture}
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}}
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\newinst[1]{exchange}{\shortstack{Taler (exchange) \\
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\\ \begin{tikzpicture}[shape aspect=.5]
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\tikzset{every node/.style={cylinder,shape border rotate=90, draw,fill=gray!25}}
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\node at (1.5,0) {\shortstack{{{\tiny Database}}}};
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\end{tikzpicture}
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}}
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\newinst[1]{bank}{\shortstack{Merchant bank \\
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\\ \begin{tikzpicture}
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\node [fill=gray!20,draw=black,thick,align=center] {Commercial \\ Accounts};
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\end{tikzpicture}
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}}
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\postlevel
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\mess[0]{wallet}{Browse catalog}{merchant}
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\mess[0]{merchant}{Commercial offer}{wallet}
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\begin{callself}{wallet}{Review offer}{}
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\end{callself}
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2023-07-02 16:09:09 +02:00
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\mess[0]{wallet}{Pay {(Coins)}}{merchant}
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2023-05-07 17:52:46 +02:00
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\mess[0]{merchant}{Deposit {(Coins)}}{exchange}
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\begin{sdblock}{Acceptable account?}{}
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\mess[0]{exchange}{{Refuse deposit}}{merchant}
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\mess[0]{merchant}{{Refund purchase}}{wallet}
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\end{sdblock}
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\mess[0]{exchange}{{Confirm deposit}}{merchant}
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\mess[0]{merchant}{Fulfill order}{wallet}
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\begin{callself}{exchange}{Aggregate transactions}{}
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\end{callself}
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\begin{sdblock}{KYC/AML required?}{}
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\begin{callself}{exchange}{Figures~\ref{fig:proc:kyc}, \ref{fig:proc:aml}}{}
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\end{callself}
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\end{sdblock}
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\mess[0]{exchange}{{Initiate transfer}}{bank}
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\end{sequencediagram}
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2023-07-02 16:09:09 +02:00
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\caption{Payments from a customer to merchant result in
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depositing coins at the Taler exchange (payment service provider)
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which then credits the merchant's bank account.
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The KYC/AML checks are described in Section~\ref{sec:kyc:deposit}}
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2023-05-07 17:52:46 +02:00
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\label{fig:int:pay}
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\end{figure}
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{\bf Internal note:} The exchange refusing a deposit immediately based on
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unaccaptable merchant accounts may not be fully implemented (this is a very
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recent feature, after all); especially the merchant then automatically
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refunding the purchase to the customer is certainly missing. However,
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the entire situation only arises when a merchant is incorrectly configured
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and in violation of the terms of service.
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