How to use API keys to Authenticate Requests From an API

Question

I'm Trying to get the latitude and longitude of an address using the Geocoding API. That's my code:

JSONObject jsonObject = new JSONObject(response.body().toString());
                        Toast.makeText(TrackingOrder.this, jsonObject + " ", Toast.LENGTH_SHORT).show();
                        String lat = ((JSONArray) jsonObject.get("results"))
                                .getJSONObject(0)
                                .getJSONObject("geometry")
                                .getJSONObject("location")
                                .get("lat").toString();
                        String lng = ((JSONArray) jsonObject.get("results"))
                                .getJSONObject(0)
                                .getJSONObject("geometry")
                                .getJSONObject("location")
                                .get("lng").toString();

The Problem is I'm receiving "Access Denied" response

 "error_message" : "You must use an API key to authenticate each request to Google Maps Platform APIs. For additional information, please refer to http://g.co/dev/maps-no-account",
       "results" : [],
       "status" : "REQUEST_DENIED"
    }

I Generate an API Key, restrict it, link it with my android app (Name,SHA)and enable Geocoding API I try to call this request on the Browser the same problem(the same Output):

https://maps.googleapis.com/maps/api/geocode/json?address=1600+Amphitheatre+Parkway,+Mountain+View,+CA&key=YOUR_API_KEY