diff --git a/src/ListManagerInterface.hh b/src/ListManagerInterface.hh
new file mode 100644
index 0000000..9134234
--- /dev/null
+++ b/src/ListManagerInterface.hh
@@ -0,0 +1,33 @@
+// This file is under GNU General Public License 3.0
+// see LICENSE.txt
+
+#ifndef LIBPEPADAPTER_LISTMANAGERINTERFACE_HH
+#define LIBPEPADAPTER_LISTMANAGERINTERFACE_HH
+
+#include <pEp/message_api.h>
+
+namespace pEp {
+    class ListManagerInterface {
+    public:
+        // update functions
+        // Group create/destroy
+        virtual void create(
+            pEp_identity *group_identity,
+            pEp_identity *manager,
+            identity_list *memberlist) = 0;
+        virtual void dissolve(pEp_identity *group_identity) = 0;
+
+        // Members create/destroy
+        virtual void join(pEp_identity *group_identity, pEp_identity *as_member) = 0;
+        virtual void remove_member(pEp_identity *group_identity, pEp_identity *group_member) = 0;
+
+        // query functions
+        virtual identity_list *groups() = 0;
+        virtual pEp_identity *manager(const pEp_identity *const group) = 0;
+        virtual identity_list *members(const pEp_identity *const group) = 0;
+
+    private:
+    };
+} // namespace pEp
+
+#endif // LIBPEPADAPTER_LISTMANAGERINTERFACE_HH