2023-05-07 17:52:46 +02:00
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\section{Refund}
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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[2]{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[2]{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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\postlevel
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\begin{callself}{merchant}{Initiate refund}{}
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\end{callself}
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\mess[0]{merchant}{{Refund offer (QR code)}}{wallet}
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2023-05-07 18:37:24 +02:00
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\mess[0]{wallet}{Download refund}{merchant}
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2023-05-07 17:52:46 +02:00
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\mess[0]{merchant}{Approve refund}{exchange}
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\mess[0]{exchange}{Confirm refund}{merchant}
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\mess[0]{merchant}{Return refund confirmation}{wallet}
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\end{sequencediagram}
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\caption{Refund processing when a merchant is unable to fulfill
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a contract. Refunds must happen {\em before} the
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exchange has aggregated the original transaction for
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a bank transfer to the merchant. Furthermore, refunds
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can only go to the customer who made the original payment
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and the refund cannot exceed the amount of the original
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payment.}
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\label{fig:int:refund}
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\end{figure}
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