56 lines
2.0 KiB
TeX
56 lines
2.0 KiB
TeX
\section{Pull payment (aka invoicing)}
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\begin{figure}[h!]
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\begin{sequencediagram}
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\newinst{payer}{\shortstack{Payer \\
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\\ \begin{tikzpicture}
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\node [fill=gray!20,draw=black,thick,align=center] {Pre-funded \\ Wallet};
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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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\newinst[2]{payee}{\shortstack{Payee \\
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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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\postlevel
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\begin{callself}{payee}{Review pull payment fees}{}
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\end{callself}
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\mess[0]{payee}{{Create invoice (Wallet ID)}}{exchange}
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\mess[0]{exchange}{{Invoice ready}}{payee}
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\mess[0]{payee}{{Send invoice (e.g. via QR code)}}{payer}
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\begin{callself}{payer}{Review invoice}{}
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\end{callself}
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\mess[0]{payer}{{Make payment (Coins)}}{exchange}
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\begin{sdblock}{Domestic wallet?}{}
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\begin{callself}{exchange}{Figure~\ref{fig:proc:domestic}}{}
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\end{callself}
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\end{sdblock}
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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}{{Distribute digital cash}}{payee}
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\end{sequencediagram}
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\caption{Interactions between wallets and Taler exchange
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in a pull payment.}
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\label{fig:int:pull}
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\end{figure}
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We do {\bf not} permit the payer to regain control over their funds, once the
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payment was made they are locked {\em until} the payee passes the KYC/AML
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checks. We only do the AML/KYC process once the funds are locked at the
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exchange. This ensures we know the actual transacted amounts (which may be
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lower than the total amounts requested) and prevents risk-free probing
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attacks.
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