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diff --git a/src/messenger/messenger_api_message_kind.h b/src/messenger/messenger_api_message_kind.h
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+++ b/src/messenger/messenger_api_message_kind.h
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+/*
+   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_message_kind.h
+ * @brief GNUnet MESSENGER service
+ */
+
+#ifndef GNUNET_SERVICE_MESSENGER_MESSAGE_KIND_H
+#define GNUNET_SERVICE_MESSENGER_MESSAGE_KIND_H
+
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_identity_service.h"
+#include "gnunet_time_lib.h"
+
+#include "messenger_api_message.h"
+#include "gnunet-service-messenger_service.h"
+
+/**
+ * Creates and allocates a new join message containing the clients EGO public <i>key</i>.
+ * (all values are stored as copy)
+ *
+ * @param[in] key Private key of EGO
+ * @return New message
+ */
+struct GNUNET_MESSENGER_Message*
+create_message_join (const struct GNUNET_IDENTITY_PrivateKey *key);
+
+/**
+ * Creates and allocates a new leave message.
+ *
+ * @return New message
+ */
+struct GNUNET_MESSENGER_Message*
+create_message_leave ();
+
+/**
+ * Creates and allocates a new name message containing the <i>name</i> to change to.
+ * (all values are stored as copy)
+ *
+ * @param[in] name New name
+ * @return New message
+ */
+struct GNUNET_MESSENGER_Message*
+create_message_name (const char *name);
+
+/**
+ * Creates and allocates a new key message containing the public <i>key</i> to change to derived
+ * from its private counterpart. (all values are stored as copy)
+ *
+ * @param[in] key Private key of EGO
+ * @return New message
+ */
+struct GNUNET_MESSENGER_Message*
+create_message_key (const struct GNUNET_IDENTITY_PrivateKey *key);
+
+/**
+ * Creates and allocates a new id message containing the unique member id to change to.
+ * (all values are stored as copy)
+ *
+ * @param[in] unique_id Unique member id
+ * @return New message
+ */
+struct GNUNET_MESSENGER_Message*
+create_message_id (const struct GNUNET_ShortHashCode *unique_id);
+
+/**
+ * Creates and allocates a new request message containing the <i>hash</i> of a missing message.
+ * (all values are stored as copy)
+ *
+ * @param[in] hash Hash of message
+ * @return New message
+ */
+struct GNUNET_MESSENGER_Message*
+create_message_request (const struct GNUNET_HashCode *hash);
+
+/**
+ * Creates and allocates a new invite message containing the peer identity of an entrance peer
+ * to a room using a given <i>key</i> as shared secret for communication.
+ * (all values are stored as copy)
+ *
+ * @param[in] door Peer identity
+ * @param[in] key Shared secret of a room
+ * @return New message
+ */
+struct GNUNET_MESSENGER_Message*
+create_message_invite (const struct GNUNET_PeerIdentity *door,
+                       const struct GNUNET_HashCode *key);
+
+/**
+ * Creates and allocates a new <i>text</i> message containing a string representing text.
+ * (all values are stored as copy)
+ *
+ * @param[in] text Text
+ * @return New message
+ */
+struct GNUNET_MESSENGER_Message*
+create_message_text (const char *text);
+
+/**
+ * Creates and allocates a new delete message containing the <i>hash</i> of a message to delete after a specific <i>delay</i>.
+ * (all values are stored as copy)
+ *
+ * @param[in] hash Hash of message
+ * @param[in] delay Delay of deletion
+ * @return New message
+ */
+struct GNUNET_MESSENGER_Message*
+create_message_delete (const struct GNUNET_HashCode *hash,
+                       const struct GNUNET_TIME_Relative delay);
+
+#endif //GNUNET_SERVICE_MESSENGER_MESSAGE_KIND_H