config.api_version = SPOTIFY_API_VERSION;
        config.application_key = [appKey bytes];
        config.application_key_size = [appKey length];
        config.user_agent = [userAgent UTF8String];
        config.settings_location = [applicationSupportDirectory UTF8String];
            config.cache_location = [cacheDirectory UTF8String];
        //config.settings_location = config.cache_location = [cacheDirectory UTF8String];
        config.userdata = (void *)self;
        config.callbacks = &_callbacks;