I need to send some data to web server with POST method.

I Only have information, that I should send "order_id" and "status".
I only get ""status_id missing!".

With CURL it works OK:
curl.exe  -d "order_id=44&status=19" -k  -X POST https://some web 
store.com/index.php?route=order/manage/updateStatus

What else shoul I do to make my OPAL code POST work?

Thx Jure
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method run(var eventInfo Event)
var
    oaXMLHTTP oleAuto
    RequestURL string
    result string
    isOK logical
    msgStr string
endvar
    RequestURL = "https://www.some web 
store.com/index.php?route=order/manage/updateStatus"
    result = ""
    isOK = false

    msgStr =         "<order_id>44</order_id>"
                        + "<status_id>19</status_id>"

    try
       if oaXMLHTTP.open("Msxml2.XMLHTTP.3.0") then
          oaXMLHTTP^open("POST",RequestURL, false)
           oaXMLHTTP^setRequestHeader("Content-Type", "application/html\n")
           oaXMLHTTP^send(msgStr)
           result = oaXMLHTTP^responseText
           isOK = true
        endif
    onFail
    endTry
    if not isOK then
       errorShow()
         return
    endif

    result.view("Returned")

endMethod