blob: 3f11e5600691fc02a7b7edca6025f02e00a840a7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
\section{Refund}
\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]{merchant}{\shortstack{Merchant \\
\\ \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]{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}
}}
\postlevel
\begin{callself}{merchant}{Initiate refund}{}
\end{callself}
\mess[0]{merchant}{{Refund offer (QR code)}}{wallet}
\mess[0]{wallet}{Download refund}{merchant}
\mess[0]{merchant}{Approve refund}{exchange}
\mess[0]{exchange}{Confirm refund}{merchant}
\mess[0]{merchant}{Return refund confirmation}{wallet}
\end{sequencediagram}
\caption{Refund processing when a merchant is unable to fulfill
a contract. Refunds must happen {\em before} the
exchange has aggregated the original transaction for
a bank transfer to the merchant. Furthermore, refunds
can only go to the customer who made the original payment
and the refund cannot exceed the amount of the original
payment.}
\label{fig:int:refund}
\end{figure}
|
