Set Maps API key in Script Editor

Question

As far as I understand, in order to track our quota usage, we need to provide our API key to the Google App Service on the service we are planning to use.

In my case

Answer 1

I also have been eager to find this answer for a long time and am happy to say that I've found it. It looks like Google might have just made this available around Oct 14, 2015 based on the date this page was updated.

You can leverage the UrlFetchApp to add your API key. The link I posted above should help with obtaining that key.

function directionsAPI(origin, destination) {
 var Your_API_KEY = "Put Your API Key Here";
 var serviceUrl = "https://maps.googleapis.com/maps/api/directions/json?origin="+origin+"&destination="+destination+
"&mode="+Maps.DirectionFinder.Mode.DRIVING+"&alternatives="+Boolean(1)+"&key="+Your_API_KEY;

 var options={
  muteHttpExceptions:true,
  contentType: "application/json",
 };

 var response=UrlFetchApp.fetch(serviceUrl, options);
  if(response.getResponseCode() == 200) {
   var directions = JSON.parse(response.getContentText());
    if (directions !== null){
     return directions;
     }
    }
  return false;
 }

So walking through the code... first put in your API key. Then choose your parameters in the var serviceUrl. I've thrown in additional parameters (mode and alternatives) to show how you can add them. If you don't want them, remove them.

With UrlFetch you can add options. I've used muteHttpExceptions so that the fetch will not throw an exception if the response code indicates failure. That way we can choose a return type for the function instead of it throwing an exception. I'm using JSON for the content type so we can use the same format to send and retrieve the request. A response code of 200 means success, so directions will then parse and act like the object that getDirections() would return. The function will return false if the UrlFetch was not successful (a different response code) or if the object is null.

You will be able to see the queries in real time in your developer console when you look in the Google Maps Directions API. Be sure that billing is enabled, and you will be charged once you exceed the quotas.