public function sendNormal(array $params)
    {
        $base = [
            'total_num' => 1,
            'client_ip' => $params['client_ip'] ?? Support\get_server_ip(),
            'wxappid' => $this->app['config']->app_id,
        ];

        return $this->safeRequest('mmpaymkttransfers/sendredpack', array_merge($base, $params));
    }