Token en callback

web.php

Route::get('/', function () {
    $query = http_build_query([
        'client_id' => 3,
        'redirect_uri' => 'http://testje.dev/callback',
        'response_type' => 'code',
        'scope' => 'read write'
    ]);

    return redirect('https://nostradamus:t3mp3r@dev2.temper.works/oauth/authorize?'.$query);
});
Route::get('/callback', function (Request $request) {
    $http = new GuzzleHttp\Client;

    $response = $http->post('https://dev2.temper.works/oauth/token', [
        'form_params' => [
            'grant_type' => 'authorization_code',
            'client_id' => '3',
            'client_secret' => 'lNy3sOZlU5gwIMpcmDagKLjConQpsezrEDWcabyc',
            'redirect_uri' => 'http://testje.dev/callback',
            'code' => $request->get("code"),
        ],
    ]);

    return json_decode((string) $response->getBody(), true);
});