Google Directions API failing to return results in iOS

I’m trying to use Google Directions API. I have the SDK all set up. I have enabled Google Maps SDK for iOS under the Services in the developer console. Below is the URL I've built to get the directions.

There are two types of keys in the developer console.

First I tried with the Key for iOS apps.

https://maps.googleapis.com/maps/api/directions/json?origin=-37.814107,144.96328&destination=-31.953004,115.857469&key=<Key for iOS apps>

But I got the error This IP, site or mobile application is not authorized to use this API key.

When I searched for a solution to this error I saw in a few StackOverflow answers (1, 2) that iOS keys are not supported. In the answers they're talking about the Google Places API but I thought it might be the same case with Directions because the error was the same.

So I replaces the Key for iOS apps with Key for browser apps and ran it again but I got a new error This API project is not authorized to use this API. Please ensure that this API is activated in the APIs Console.

My question is are there any other APIs I have to activate in the Services to get this working? These are the other map related Google APIs in the list.

The API "Google Maps SDK for iOS" - it is only for integrating the "Google Maps SDK"...

If you want to “use” Directions.. you have to “activate” in the Google console: "Directions API” , too developers.google.com/maps/documentation/directions

Happy coding!