public function updateCustomAttributes($custom)
    {

        $data = [];
        foreach (func_get_args() as $value) {
            $data = array_merge($data, $value);
        }
        $result = $this->getClient()
            ->send('/v1/customers/'.$this->uuid.'/attributes/custom', 'PUT', [
                'custom' => $data
            ]);

        $this->attributes['custom'] = $result['custom'];
        return $result['custom'];
    }