async public static Task <byte[]> GetInitInfo()
        {
            var url0 = "GetInitInfo?" + UserOptions.BusinessWebString();

            var rez = await WebService.Instance.GetGzipBytes(url0);

            if (!rez.Success)
            {
                return(null);
            }

            return(rez.Bytes);
        }
        async public static Task <GetCheckApkReturn> GetCheckApkVersion(int apkversion)
        {
            var url0 = "OnePosCheckApkVersion?apkversion=" + apkversion + "&" + UserOptions.BusinessWebString();

            var rez = await WebService.Instance.Get(url0);

            if (!rez.Success)
            {
                return(null);
            }

            var result = DeserializeObjectFromStream <GetCheckApkReturn>(rez.Value);

            return(result);
        }