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diff --git a/src/game-server/buysell.h b/src/game-server/buysell.h
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+/*
+ *  The Mana Server
+ *  Copyright (C) 2007-2010  The Mana World Development Team
+ *
+ *  This file is part of The Mana Server.
+ *
+ *  The Mana Server 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 of the License, or
+ *  any later version.
+ *
+ *  The Mana Server 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with The Mana Server.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GAMESERVER_BUYSELL_H
+#define GAMESERVER_BUYSELL_H
+
+#include <vector>
+
+class Character;
+class Actor;
+
+class BuySell
+{
+    public:
+
+        /**
+         * Sets up a trade between a character and an NPC.
+         */
+        BuySell(Character *, bool sell);
+
+        /**
+         * Cancels the trade.
+         */
+        void cancel();
+
+        /**
+         * Registers an item and indicates how many the NPC is ready to trade
+         * and how much it will cost.
+         * @return true if at least one item was registered.
+         */
+        bool registerItem(int id, int amount, int cost);
+
+        /**
+         * Registers every player's item at an average cost given by the ItemDB.
+         * @return the number of different soldable items.
+         */
+        int registerPlayerItems();
+
+        /**
+         * Sends the item list to player.
+         * @return true if at least one item was registered before start.
+         */
+        bool start(Actor *actor);
+
+        /**
+         * Performs the trade.
+         */
+        void perform(int id, int amount);
+
+    private:
+
+        ~BuySell();
+
+        struct TradedItem
+        {
+            unsigned short itemId, amount, cost;
+        };
+
+        typedef std::vector< TradedItem > TradedItems;
+
+        /** The attribute ID of the currency to use. Hardcoded for now (FIXME) */
+        unsigned int mCurrencyId;
+
+        Character *mChar;   /**< Character involved. */
+        TradedItems mItems; /**< Traded items. */
+        bool mSell;         /**< Are items sold? */
+};
+
+#endif