public function getAppCodeUnlimit($scene, $width = 430, $autoColor = false, $lineColor = ['r' => 0, 'g' => 0, 'b' => 0])
    {
        $params = [
            'scene' => $scene,
            'width' => $width,
            'auto_color' => $autoColor,
            'line_color' => $lineColor,
        ];

        return $this->getStream(self::API_GET_WXACODE_UNLIMIT, $params);
    }