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+..
+ This file is part of GNU TALER.
+ Copyright (C) 2014, 2015, 2016 INRIA
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 2.1, or (at your option) any later version.
+ TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
+ You should have received a copy of the GNU Lesser General Public License along with
+ TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
+
+ @author Marcello Stanisci
+
+========
+Merchant
+========
+
+------------
+Introduction
+------------
+TBD
+
+.. _merchant-arch:
+
+------
+Design
+------
+
+TO REVIEW::
+
+ The `frontend` is the existing shopping portal of the merchant.
+ The architecture tries to minimize the amount of modifications necessary
+ to the `frontend` as well as the trust that needs to be placed into the
+ `frontend` logic. Taler requires the frontend to facilitate two
+ JSON-based interactions between the wallet and the `backend`, and
+ one of those is trivial.
+
+ The `backend` is a standalone C application intended to implement all
+ the cryptographic routines required to interact with the Taler wallet
+ and a Taler exchange.