Lookup and account in the ledger
using System.Net;
string uri = "https://fusion.superion.com/FusionOSServices/v1/ONESolution/AccountLookup/Lookup";
var xmlText = "<AccountLookupRequest><Ledger>GL</Ledger><Year>2015</Year><AccountLookupParameter><Field>OrgKey</Field><Operator>6</Operator><Value>101*</Value></AccountLookupParameter></AccountLookupRequest>"
using (WebClient req = new WebClient())
{
string stringResult = wc.UploadString(new Uri(uri), "POST", xmlText);
XmlDocument response = xmlDoc.LoadXml(stringResult);
// TODO
}