private string BuildSubscriptionStringToSign()
{
StringBuilder stringToSign = new StringBuilder();
stringToSign.Append("Message\n");
stringToSign.Append(this.MessageText);
stringToSign.Append("\n");
stringToSign.Append("MessageId\n");
stringToSign.Append(this.MessageId);
stringToSign.Append("\n");
stringToSign.Append("SubscribeURL\n");
stringToSign.Append(this.SubscribeURL);
stringToSign.Append("\n");
stringToSign.Append("Timestamp\n");
stringToSign.Append(this.TimestampString);
stringToSign.Append("\n");
stringToSign.Append("Token\n");
stringToSign.Append(this.Token);
stringToSign.Append("\n");
stringToSign.Append("TopicArn\n");
stringToSign.Append(this.TopicArn);
stringToSign.Append("\n");
stringToSign.Append("Type\n");
stringToSign.Append(this.Type);
stringToSign.Append("\n");
return stringToSign.ToString();
}