fix duplicate label
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@ -792,7 +792,7 @@ a Taler wallet is installed (as it is in Figure~\ref{fig:shopping}).
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}
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\end{lstlisting}
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\caption{Minimal Taler contract over a digital article with a value of \EUR{0.10}}
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\label{listing:contract}
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\label{listing:json-contract}
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\end{figure*}
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\begin{figure*}[h!]
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@ -816,7 +816,7 @@ X-Taler-Contract-Url: https://myshop/generate-contract?product=42
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\end{figure*}
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The offer URL of the Web shop can then initiate payments by sending a
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\emph{contract proposal} (Figure~\ref{listing:contract}) to the wallet, either via the HTTP status
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\emph{contract proposal} (Figure~\ref{listing:json-contract}) to the wallet, either via the HTTP status
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code {\tt 402 Payment Required} (Figure~\ref{listing:http-contract}), or via Taler's JavaScript API
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(Figure~\ref{listing:contract}). The wallet then presents the
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contract to the user. The format of the contract is in an extensible
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