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@@ -1225,12 +1225,6 @@ question for the future is thus whether this data collection will be
done on behalf of the citizens and under their control, or on behalf
of the Reich of big data corporations.
-We encourage readers to try our prototype for Taler
-at \url{https://demo.taler.net/}, and to ponder why the billion dollar
-e-commerce industry still relies mostly on TLS for security given
-that usability, security and privacy can clearly {\em all} be improved
-simultaneously using a modern payment protocol.
-
% These APIs are all RESTful in the modern sense because that greatly
% simplify integrating Taler with web shops and browsers.
@@ -1245,6 +1239,21 @@ thank Neal Walfield for comments on an earlier draft of the paper.
\appendix
+We encourage readers to try our prototype for Taler
+at \url{https://demo.taler.net/}, and to ponder why the billion dollar
+e-commerce industry still relies mostly on TLS for security given
+that usability, security and privacy can clearly {\em all} be improved
+simultaneously using a modern payment protocol.
+
+The following pages include figures with more detailed illustrations
+of various payment protocols. They are based on resources from the
+W3c Web Payments Interest Group.
+
+Figures~\ref{listing:presence} and~\ref{listing:contract} provide more
+detailed sample source code for how merchants might integrate their
+systems with Taler.
+
+
\begin{figure*}
\begin{center}
\includegraphics[width=0.95\textwidth]{figs/cc3ds.pdf}