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diff --git a/src/service/messenger/gnunet-service-messenger_service.h b/src/service/messenger/gnunet-service-messenger_service.h
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+++ b/src/service/messenger/gnunet-service-messenger_service.h
@@ -0,0 +1,200 @@
+/*
+   This file is part of GNUnet.
+   Copyright (C) 2020--2023 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/gnunet-service-messenger_service.h
+ * @brief GNUnet MESSENGER service
+ */
+
+#ifndef GNUNET_SERVICE_MESSENGER_SERVICE_H
+#define GNUNET_SERVICE_MESSENGER_SERVICE_H
+
+#include "platform.h"
+#include "gnunet_configuration_lib.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_identity_service.h"
+
+#include "gnunet-service-messenger_list_handles.h"
+
+#include "messenger_api_contact_store.h"
+
+#include "gnunet-service-messenger_room.h"
+#include "gnunet-service-messenger_sender_session.h"
+
+struct GNUNET_MESSENGER_Service
+{
+  const struct GNUNET_CONFIGURATION_Handle *config;
+  struct GNUNET_SERVICE_Handle *service;
+
+  struct GNUNET_SCHEDULER_Task *shutdown;
+
+  struct GNUNET_PeerIdentity *peer;
+  char *dir;
+
+  struct GNUNET_CADET_Handle *cadet;
+
+  struct GNUNET_MESSENGER_ContactStore contact_store;
+
+  struct GNUNET_MESSENGER_ListHandles handles;
+
+  struct GNUNET_CONTAINER_MultiHashMap *rooms;
+};
+
+/**
+ * Creates and allocates a new service using a given <i>config</i> and a GNUnet service handle.
+ *
+ * @param[in] config Configuration
+ * @param[in,out] service_handle GNUnet service handle
+ * @return New service
+ */
+struct GNUNET_MESSENGER_Service*
+create_service (const struct GNUNET_CONFIGURATION_Handle *config,
+                struct GNUNET_SERVICE_Handle *service_handle);
+
+/**
+ * Destroys a <i>service</i> and frees its memory fully.
+ *
+ * @param[in,out] service Service
+ */
+void
+destroy_service (struct GNUNET_MESSENGER_Service *service);
+
+/**
+ * Returns the used contact store of a given <i>service</i>.
+ *
+ * @param[in,out] service Service
+ * @return Contact store
+ */
+struct GNUNET_MESSENGER_ContactStore*
+get_service_contact_store (struct GNUNET_MESSENGER_Service *service);
+
+/**
+ * Creates and adds a new handle to a <i>service</i> using a given message queue.
+ *
+ * @param[in,out] service Service
+ * @param[in,out] mq Message queue
+ * @return New handle
+ */
+struct GNUNET_MESSENGER_SrvHandle*
+add_service_handle (struct GNUNET_MESSENGER_Service *service,
+                    struct GNUNET_MQ_Handle *mq);
+
+/**
+ * Removes a <i>handle</i> from a <i>service</i> and destroys it.
+ *
+ * @param[in,out] service Service
+ * @param[in,out] handle Handle
+ */
+void
+remove_service_handle (struct GNUNET_MESSENGER_Service *service,
+                       struct GNUNET_MESSENGER_SrvHandle *handle);
+
+/**
+ * Tries to write the peer identity of the peer running a <i>service</i> on to the <i>peer</i>
+ * parameter. The functions returns #GNUNET_OK on success, otherwise #GNUNET_SYSERR.
+ *
+ * @param[in,out] service Service
+ * @param[out] peer Peer identity
+ * @return #GNUNET_OK on success, otherwise #GNUNET_SYSERR
+ */
+int
+get_service_peer_identity (struct GNUNET_MESSENGER_Service *service,
+                           struct GNUNET_PeerIdentity *peer);
+
+/**
+ * Returns the room identified by a given <i>key</i> for a <i>service</i>. If the service doesn't know any room
+ * using the given key, NULL gets returned.
+ *
+ * @param[in] service Service
+ * @param[in] key Key of room
+ * @return Room or NULL
+ */
+struct GNUNET_MESSENGER_SrvRoom*
+get_service_room (const struct GNUNET_MESSENGER_Service *service,
+                  const struct GNUNET_HashCode *key);
+
+/**
+ * Tries to open a room using a given <i>key</i> for a <i>service</i> by a specific <i>handle</i>. The room will be
+ * created if necessary. If the function is successful, it returns #GNUNET_YES, otherwise #GNUNET_NO.
+ *
+ * @param[in,out] service Service
+ * @param[in,out] handle Handle
+ * @param[in] key Key of room
+ * @return #GNUNET_YES on success, otherwise #GNUNET_NO
+ */
+int
+open_service_room (struct GNUNET_MESSENGER_Service *service,
+                   struct GNUNET_MESSENGER_SrvHandle *handle,
+                   const struct GNUNET_HashCode *key);
+
+/**
+ * Tries to enter a room using a given <i>key</i> for a <i>service</i> by a specific <i>handle</i>. The room will
+ * be created if necessary. If the function is successful, it returns #GNUNET_YES, otherwise #GNUNET_NO.
+ *
+ * The room will be entered through the peer identitied by the peer identity provided as <i>door</i> parameter and
+ * a new connection will be made.
+ *
+ * @param[in,out] service Service
+ * @param[in,out] handle Handle
+ * @param[in] door Peer identity
+ * @param[in] key Key of room
+ * @return #GNUNET_YES on success, otherwise #GNUNET_NO
+ */
+int
+entry_service_room (struct GNUNET_MESSENGER_Service *service,
+                    struct GNUNET_MESSENGER_SrvHandle *handle,
+                    const struct GNUNET_PeerIdentity *door,
+                    const struct GNUNET_HashCode *key);
+
+/**
+ * Tries to close a room using a given <i>key</i> for a <i>service</i> by a specific <i>handle</i>. The room will
+ * be created if necessary. If the function is successful, it returns #GNUNET_YES, otherwise #GNUNET_NO.
+ *
+ * If the specific handle is currently the host of the room for this service, a new handle which is a member will
+ * take its place. Otherwise the room will be destroyed for this service.
+ *
+ * @param[in,out] service Service
+ * @param[in,out] handle Handle
+ * @param[in] key Key of room
+ * @return #GNUNET_YES on success, otherwise #GNUNET_NO
+ */
+int
+close_service_room (struct GNUNET_MESSENGER_Service *service,
+                    struct GNUNET_MESSENGER_SrvHandle *handle,
+                    const struct GNUNET_HashCode *key);
+
+/**
+ * Sends a received or sent <i>message</i> with a given <i>hash</i> to each handle of a <i>service</i> which
+ * is currently member of a specific <i>room</i> for handling it in the client API.
+ *
+ * @param[in,out] service Service
+ * @param[in,out] room Room
+ * @param[in] session Sender session
+ * @param[in] message Message
+ * @param[in] hash Hash of message
+ */
+void
+handle_service_message (struct GNUNET_MESSENGER_Service *service,
+                        struct GNUNET_MESSENGER_SrvRoom *room,
+                        const struct GNUNET_MESSENGER_SenderSession *session,
+                        const struct GNUNET_MESSENGER_Message *message,
+                        const struct GNUNET_HashCode *hash);
+
+#endif //GNUNET_SERVICE_MESSENGER_SERVICE_H