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diff --git a/src/messenger/messenger_api_handle.h b/src/messenger/messenger_api_handle.h
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+++ b/src/messenger/messenger_api_handle.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_handle.h
+ * @brief messenger api: client implementation of GNUnet MESSENGER service
+ */
+
+#ifndef GNUNET_MESSENGER_API_HANDLE_H
+#define GNUNET_MESSENGER_API_HANDLE_H
+
+#include "platform.h"
+#include "gnunet_cadet_service.h"
+#include "gnunet_container_lib.h"
+#include "gnunet_crypto_lib.h"
+#include "gnunet_identity_service.h"
+#include "gnunet_peer_lib.h"
+
+#include "gnunet_messenger_service.h"
+
+#include "messenger_api_contact.h"
+#include "messenger_api_room.h"
+
+struct GNUNET_MESSENGER_Handle
+{
+  const struct GNUNET_CONFIGURATION_Handle *cfg;
+
+  struct GNUNET_MQ_Handle *mq;
+
+  GNUNET_MESSENGER_IdentityCallback identity_callback;
+  void *identity_cls;
+
+  GNUNET_MESSENGER_MessageCallback msg_callback;
+  void *msg_cls;
+
+  char *name;
+  struct GNUNET_IDENTITY_PublicKey *pubkey;
+
+  struct GNUNET_TIME_Relative reconnect_time;
+  struct GNUNET_SCHEDULER_Task *reconnect_task;
+
+  struct GNUNET_CONTAINER_MultiHashMap *rooms;
+  struct GNUNET_CONTAINER_MultiHashMap *contacts;
+};
+
+/**
+ * Creates and allocates a new handle using a given configuration and a custom message callback
+ * with a given closure for the client API.
+ *
+ * @param cfg Configuration
+ * @param msg_callback Message callback
+ * @param msg_cls Closure
+ * @return New handle
+ */
+struct GNUNET_MESSENGER_Handle*
+create_handle (const struct GNUNET_CONFIGURATION_Handle *cfg, GNUNET_MESSENGER_IdentityCallback identity_callback,
+               void *identity_cls, GNUNET_MESSENGER_MessageCallback msg_callback, void *msg_cls);
+
+/**
+ * Destroys a <i>handle</i> and frees its memory fully from the client API.
+ *
+ * @param handle Handle
+ */
+void
+destroy_handle (struct GNUNET_MESSENGER_Handle *handle);
+
+/**
+ * Sets the name of a <i>handle</i> to a specific <i>name</i>.
+ *
+ * @param handle Handle
+ * @param name New name
+ */
+void
+set_handle_name (struct GNUNET_MESSENGER_Handle *handle, const char *name);
+
+/**
+ * Returns the current name of a given <i>handle</i> or NULL if no valid name was assigned yet.
+ *
+ * @param handle Handle
+ * @return Name of the handle or NULL
+ */
+const char*
+get_handle_name (const struct GNUNET_MESSENGER_Handle *handle);
+
+/**
+ * Sets the public key of a given <i>handle</i> to a specific public key.
+ *
+ * @param handle Handle
+ * @param pubkey Public key
+ */
+void
+set_handle_key (struct GNUNET_MESSENGER_Handle *handle, const struct GNUNET_IDENTITY_PublicKey *pubkey);
+
+/**
+ * Returns the public key of a given <i>handle</i>.
+ *
+ * @param handle Handle
+ * @return Public key of the handle
+ */
+const struct GNUNET_IDENTITY_PublicKey*
+get_handle_key (const struct GNUNET_MESSENGER_Handle *handle);
+
+/**
+ * Returns a contact known to a <i>handle</i> identified by a given public key. If not matching
+ * contact is found, NULL gets returned.
+ *
+ * @param handle Handle
+ * @param pubkey Public key of EGO
+ * @return Contact or NULL
+ */
+struct GNUNET_MESSENGER_Contact*
+get_handle_contact_by_pubkey (const struct GNUNET_MESSENGER_Handle *handle,
+                              const struct GNUNET_IDENTITY_PublicKey *pubkey);
+
+/**
+ * Changes the public key for a <i>contact</i> known to a <i>handle</i> to a specific public key and
+ * updates local map entries to access the contact by its updated key.
+ *
+ * @param handle Handle
+ * @param contact Contact
+ * @param pubkey Public key of EGO
+ */
+void
+swap_handle_contact_by_pubkey (struct GNUNET_MESSENGER_Handle *handle, struct GNUNET_MESSENGER_Contact *contact,
+                               const struct GNUNET_IDENTITY_PublicKey *pubkey);
+
+/**
+ * Marks a room known to a <i>handle</i> identified by a given <i>key</i> as open.
+ *
+ * @param handle Handle
+ * @param key Key of room
+ */
+void
+open_handle_room (struct GNUNET_MESSENGER_Handle *handle, const struct GNUNET_HashCode *key);
+
+/**
+ * Adds a tunnel for a room known to a <i>handle</i> identified by a given <i>key</i> to a
+ * list of opened connections.
+ *
+ * @param handle Handle
+ * @param door Peer identity
+ * @param key Key of room
+ */
+void
+entry_handle_room_at (struct GNUNET_MESSENGER_Handle *handle, const struct GNUNET_PeerIdentity *door,
+                      const struct GNUNET_HashCode *key);
+
+/**
+ * Destroys and so implicitly closes a room known to a <i>handle</i> identified by a given <i>key</i>.
+ *
+ * @param handle Handle
+ * @param key Key of room
+ */
+void
+close_handle_room (struct GNUNET_MESSENGER_Handle *handle, const struct GNUNET_HashCode *key);
+
+#endif //GNUNET_MESSENGER_API_HANDLE_H