diff --git a/src/grp_update_interface.hh b/src/grp_update_interface.hh
new file mode 100644
index 0000000..820ae16
--- /dev/null
+++ b/src/grp_update_interface.hh
@@ -0,0 +1,44 @@
+// This file is under GNU General Public License 3.0
+// see LICENSE.txt
+
+#ifndef LIBPEPADAPTER_GRP_UPDATE_INTERFACE_HH
+#define LIBPEPADAPTER_GRP_UPDATE_INTERFACE_HH
+
+#include <pEp/message_api.h>
+#include <pEp/group.h>
+
+namespace pEp {
+    class GroupUpdateInterface {
+    public:
+        virtual PEP_STATUS adapter_group_create(
+            PEP_SESSION session,
+            pEp_identity *group_identity,
+            pEp_identity *manager,
+            identity_list *memberlist,
+            pEp_group **group) = 0;
+
+        virtual PEP_STATUS adapter_group_join(
+            PEP_SESSION session,
+            pEp_identity *group_identity,
+            pEp_identity *as_member) = 0;
+
+        virtual PEP_STATUS adapter_group_dissolve(
+            PEP_SESSION session,
+            pEp_identity *group_identity,
+            pEp_identity *manager) = 0;
+
+        virtual PEP_STATUS adapter_group_invite_member(
+            PEP_SESSION session,
+            pEp_identity *group_identity,
+            pEp_identity *group_member) = 0;
+
+        virtual PEP_STATUS adapter_group_remove_member(
+            PEP_SESSION session,
+            pEp_identity *group_identity,
+            pEp_identity *group_member) = 0;
+
+    private:
+    };
+} // namespace pEp
+
+#endif // LIBPEPADAPTER_GRP_UPDATE_INTERFACE_HH