Google Map Request Denied Trouble

I am trying to activate google maps on the page. I install composer API without problem. And added my server/domain IP in google API. checked and added the API key into config file. After that set the Controller and the Route which is like below.

My Route:

Route::get('/', 'PagesController@map');

Here is my Controller:

public function map()
{
    $response = \GoogleMaps::load('geocoding')
        ->setParam(['address' => 'tokyo'])
        ->get();

    return view('welcome', compact('response'));
}

And I am calling it on my view:

But I'm gettin this error?

{ "error_message" : "This API project is not authorized to use this API.", "results" : [], "status" : "REQUEST_DENIED" }

Any idea why is this happening? Thank you for your help!

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