src/Vinelab/Auth/Social/Provider.php
public function settings($setting = null)
    {
        if (!is_null($setting)) {
            return isset($this->settings[$setting]) ? $this->settings[$setting] : null;
        }

        return $this->settings;
    }
public function settings($setting = null)
    {
        if (!is_null($setting)) {
            return isset($this->settings[$setting]) ? $this->settings[$setting] : null;
        }

        return $this->settings;
    }
Returns settings values,
when no setting is specified all the settings
are returned, otherwise it returns the specified
settings or null.

@param setting $setting

@return mixed