int ttsd_engine_agent_set_default_pitch(int pitch);
+int ttsd_engine_agent_is_credential_needed(int uid, bool* credential_needed);
+
+int ttsd_engine_set_private_data(const char* key, const char* data);
+
+int ttsd_engine_get_private_data(const char* key, char** data);
+
/*
* TTS Engine Interfaces for client
*/
int ttsd_engine_unload_voice(const char* lang, int vctype);
-int ttsd_engine_start_synthesis(const char* lang, int vctype, const char* text, int speed, void* user_param);
+int ttsd_engine_start_synthesis(const char* lang, int vctype, const char* text, int speed, const char* credential, void* user_param);
int ttsd_engine_cancel_synthesis();