public string GetOfflineToken(long userId)
{
var now = SystemTime.Now();
var timeStamp = new DateTime(now.Year, now.Month, now.Day, now.Hour, now.Minute, now.Second, DateTimeKind.Utc);
var signature = new SignatureBuilder().Append(userId).Append(_applicationSettings.AppId).Append(timeStamp).Append(_applicationSettings.AppSecret).Sign();
var serviceParameters = new NameValueCollection(4)
{
{ "userId", userId.ToString() },
{ "appId", _applicationSettings.AppId.ToString() },
{ "timestamp", timeStamp.ToString("yyyy-MM-ddTHH:mm:ss") },
{ "signature", signature }
};
return(_platformProxy.GetOfflineToken(_servicePath + "/get-token", serviceParameters));
}