AuthController.php
public function postSignUp($request, $response)
{
      $validation = $this->validator->validate($request, [
        'first_name' => v::notEmpty()->Alpha(),
        'last_name' => v::notEmpty()->Alpha(),
        'username' => v::notEmpty()->noWhitespace()->UsernameAvailable()->length(3, 15),
        'email' => v::notEmpty()->noWhitespace()->email()->EmailAvailable(),
        'password' => v::notEmpty()->noWhitespace(),

        'password_verify' => v::notEmpty()->noWhitespace()->PasswordMatch(),

        /*
            ->EmailAvailable() = custom created
            ->UsernameAvailable() = custom created
            ->PasswordMatch() = custom created
        */
      ]);

      if ($validation->failed())
      {
          var_dump($validation);
          die();
      //    return $response->withRedirect($this->router->pathFor('auth.signup'));
      }

      $user = User::create([
        'first_name' => $request->getParam('first_name'),
        'last_name' => $request->getParam('last_name'),
        'username' => $request->getParam('username'),
        'email' => $request->getParam('email'),
        'password' => password_hash($request->getParam('password'), PASSWORD_DEFAULT),
      ]);

      $this->flash->addMessage('succes', 'You have been registered!');

      return $response->withRedirect($this->router->pathFor('home'));
}

<?php

protected $password;

 public function  __construct($password)
 {
         $this->password = $password;
    }


  public function Validate($input)
  {
      return password_verify($input, $this->password);
  }

<?php

public static $defaultTemplates = [
         self::MODE_DEFAULT => [
                self::STANDARD => "Password Doesn't Match",
          ],
  ];