int tts_dbus_request_hello(int uid);
-int tts_dbus_request_initialize(int uid);
+int tts_dbus_request_initialize(int uid, bool* credential_needed);
int tts_dbus_request_finalize(int uid);
int tts_dbus_set_sound_type(int uid, int type);
-int tts_dbus_request_add_text(int uid, const char* text, const char* lang, int vctype, int speed, int uttid);
+int tts_dbus_request_add_text(int uid, const char* text, const char* lang, int vctype, int speed, int uttid, const char* credential);
-int tts_dbus_request_play(int uid) ;
+int tts_dbus_request_play(int uid, const char* credential);
int tts_dbus_request_stop(int uid);