$api->version('v1', ['middleware' => 'api.auth', 'scopes' => ['read_user_data', 'write_user_data']], function ($api) {
    // Only access tokens with the "read_user_data" scope will be given access.
});

$api->version('v1', ['middleware' => 'api.auth'], function ($api) {
    $api->get('user', ['scopes' => 'read_user_data', function () {
        // Only access tokens with the "read_user_data" scope will be given access.
    }]);
});

use Dingo\Api\Routing\Helpers;
class UserController extends Controller
{
    use Helpers;
    public function __construct()
    {
        $this->scopes('read_user_data');
    }
}

use Dingo\Api\Routing\Helpers;
class UserController extends Controller
{
    use Helpers;
    public function __construct()
    {
        // Only apply to the index method.
        $this->scopes('read_user_data', 'index');
        // Apply to every method except the store method.
        $this->scopes('read_user_data', ['except' => 'store']);
        // Apply only to the store method.
        $this->scopes('write_user_data', ['only' => ['store']]);
    }
    public function index()
    {
        //
    }
    public function store()
    {
        //
    }
}