This service is used for Invoice Charges payment and returns receipt number
using System.Net;
string uri = "https://fusion.superion.com/FusionOSServices/v1/ONESolution/AccountsReceivable/InvoiceChargesPayments";
string xmlText =
@"
<CreateCR>
<InvoiceId>AR050509</InvoiceId>
<Peid>V6883</Peid>
<SetId></SetId>
<ReceiptDate>5/20/2020</ReceiptDate>
<BankDate></BankDate>
<BankSlip></BankSlip>
<PayerName></PayerName>
<TenderAmount>1.00</TenderAmount>
<TenderType>CA</TenderType>
<ExpDate></ExpDate>
<Reference></Reference>
<Authorization></Authorization>
</CreateCR>";
using (WebClient req = new WebClient())
{
string stringResult = wc.UploadString(new Uri(uri), "POST", xmlText);
XmlDocument response = xmlDoc.LoadXml(stringResult);
// TODO
}