//UsersController
  public function token()
  {
    $user = $this->Auth->identify();
    if (!$user) {
      throw new UnauthorizedException('Invalid username or password');
    }else{
      $this->Auth->setUser($user);
    };

    $this->set([
      'success' => true,
      'user_id'=>$user['id'],
      // SET NEW TOKEN BY REQUEST
      'token' => JWT::encode([
        'sub' => $user['id'],
        'exp' =>  time() + 604800
      ],Security::salt()),
      '_serialize' => ['success', 'token' , 'user_id']
    ]);
  }