I think this will work for you:
1. Save your Data you want to send in $dataToSend in your script.
2. Use "Insert From URL" to send the values via post (example with Google API: "http://maps.googleapis.com/maps/api/geocode/xml?address=" & $dataToSend &"®ion=en&language=en&sensor=false")
3. (Optional:) Use the response you may will get from the server to provide success messages to the user (or whatever ;-) )