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diff --git a/src/messenger/messenger_api_room.h b/src/messenger/messenger_api_room.h
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+++ b/src/messenger/messenger_api_room.h
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+/*
+   This file is part of GNUnet.
+   Copyright (C) 2020 GNUnet e.V.
+
+   GNUnet is free software: you can redistribute it and/or modify it
+   under the terms of the GNU Affero General Public License as published
+   by the Free Software Foundation, either version 3 of the License,
+   or (at your option) any later version.
+
+   GNUnet 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
+   Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+   SPDX-License-Identifier: AGPL3.0-or-later
+ */
+/**
+ * @author Tobias Frisch
+ * @file src/messenger/messenger_api_room.h
+ * @brief messenger api: client implementation of GNUnet MESSENGER service
+ */
+
+#ifndef GNUNET_MESSENGER_API_ROOM_H
+#define GNUNET_MESSENGER_API_ROOM_H
+
+#include "platform.h"
+#include "gnunet_container_lib.h"
+#include "gnunet_crypto_lib.h"
+
+#include "gnunet_messenger_service.h"
+
+#include "messenger_api_list_tunnels.h"
+#include "messenger_api_contact.h"
+#include "messenger_api_message.h"
+
+struct GNUNET_MESSENGER_Room
+{
+  struct GNUNET_MESSENGER_Handle *handle;
+  struct GNUNET_HashCode key;
+
+  int opened;
+
+  struct GNUNET_ShortHashCode *contact_id;
+
+  struct GNUNET_CONTAINER_MultiShortmap *members;
+  struct GNUNET_MESSENGER_ListTunnels entries;
+
+  struct GNUNET_CONTAINER_MultiHashMap *messages;
+};
+
+/**
+ * Creates and allocates a new room for a <i>handle</i> with a given <i>key</i> for the client API.
+ *
+ * @param handle Handle
+ * @param key Key of room
+ * @return New room
+ */
+struct GNUNET_MESSENGER_Room*
+create_room (struct GNUNET_MESSENGER_Handle *handle, const struct GNUNET_HashCode *key);
+
+/**
+ * Destroys a room and frees its memory fully from the client API.
+ *
+ * @param room Room
+ */
+void
+destroy_room (struct GNUNET_MESSENGER_Room *room);
+
+/**
+ * Returns a message locally stored from a map for a given <i>hash</i> in a <i>room</i>. If no matching
+ * message is found, NULL gets returned.
+ *
+ * @param room Room
+ * @param hash Hash of message
+ * @return Message or NULL
+ */
+const struct GNUNET_MESSENGER_Message*
+get_room_message (const struct GNUNET_MESSENGER_Room *room, const struct GNUNET_HashCode *hash);
+
+/**
+ * Handles a <i>message</i> with a given <i>hash</i> in a <i>room</i> for the client API to update
+ * members and its information. The function also stores the message in map locally for access afterwards.
+ *
+ * @param room Room
+ * @param message Message
+ * @param hash Hash of message
+ */
+void
+handle_room_message (struct GNUNET_MESSENGER_Room *room, const struct GNUNET_MESSENGER_Message *message,
+                     const struct GNUNET_HashCode *hash);
+
+#endif //GNUNET_MESSENGER_API_ROOM_H