I have an ASP script that takes a zip code and derives 
latitude/longitude coordinates. As you can see it is a simple integration. 
With such an integration I am allowed 2500 queries per day. I am going over 
that and would like to convert it to where I am using API credentials. I 
have looked and looked and cannot figure this one out. I know it is simple 
but just cannot find any code or a solution. 

Here is the existing code. I am passing a five (5) digit zip code into this 
ASP sub-routine.

Sub getLatLon(vAddress,latitude,longitude)        
                
        Set xmlhttp = Server.Createobject("MSXML2.ServerXMLHTTP")
 ' create url to post
 urlToPost = "http://maps.googleapis.com/maps/api/geocode/xml?address="; & 
vAddress & ""
 xmlhttp.Open "POST",urlToPost, false 
        xmlhttp.Send
        strRetval = xmlhttp.ResponseText
        
        print "xmlhttp.ResponseText:" & xmlhttp.ResponseText & br
        
        Set xmlhttp = nothing 

        Set objXMLDoc = CreateObject("Microsoft.XMLDOM") 
        objXMLDoc.async = False 
        objXMLDoc.loadXML(strRetval) 
        
        Set lat = objXMLDoc.documentElement.selectSingleNode("//lat")
        latitude = lat.Text
        Set lon = objXMLDoc.documentElement.selectSingleNode("//lng")
        longitude = lon.Text
End Sub
 

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