public string SerializeRFRRequestToFile(RFRRequest rfrRequest, string filePath)
{
filePath = litleFile.createRandomFile(requestDirectory, Path.GetFileName(filePath), "_temp_litleRequest.xml", litleTime);
string tempFilePath = rfrRequest.Serialize();
litleFile.AppendFileToFile(filePath, tempFilePath);
return filePath;
}