Trying to use cell data from worksheet to post data to API web service.

I'm trying to use cells on the worksheet to create the "Post" send to an api web service.
Example: below is hardcoded with the xml.
I want to use the cell data on a worksheet to create the xml.
for the
reader.Send s
part



Dim reader As New MSXML2.ServerXMLHTTP60
reader.setOption 2, (reader.getOption(2) - SXH_SERVER_CERT_IGNORE_CERT_DATE_INVALID)
Dim s As String
reader.Open "POST", "https://dr01.dev-sap.ger.com:44310/sap/commerce/esrprice?sap-client=220", False, "XXXXX", "xxxxxxger"
reader.setRequestHeader "Accept", "application/xml"

s = "<?xml version=""1.0""?>" & _
"<EsrpPriceRequest>" & _
"<QuoteNumber>0030017523</QuoteNumber>" & _
"<AccountNumber>0800000713</AccountNumber>" & _
"<Items>" & _
"<Item>3BA56</Item>" & _
"<Item>1A005</Item>" & _
"<Item>1AC47</Item>" & _
"<Item>6K305</Item>" & _
"</Items>" & _
"</EsrpPriceRequest>"




Debug.Print s
reader.Send s


Do Until reader.ReadyState = 4
DoEvents
Loop '
If reader.Status = 200 Then
MsgBox (reader.responseText)
Else
MsgBox "Unable to get data."
End If