public function getLoginUri()
    {
        $params = array(
            'response_type' => 'code',
            'client_id' => $this->_getClientId(),
            'redirect_uri' => $this->_getRedirectUri(),
            'scope' => $this->_getScope()
        );

        return $this->_getUri($this->_authEndPoint, $params);
    }