Encapsulate the data needed for a SIE import
 public SieImportResult Upload(SieImportData importData, string agencyShortName)
 {
     string url = GetUrl(agencyShortName);
     return client.Put<SieImportResult>(url, JObject.FromObject(importData).ToString());
 }
 public SieImportResult Upload(SieImportData importData, Agency agency)
 {
     return Upload(importData, agency.shortName);
 }