Geocoding Question

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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