Hooks::before(CREATE_ACCOUNT_SUCCESSFUL, function (&$transaction) {
    $requestBody = [];

    $requestBody['username'] = \Nette\Utils\Random::generate(24);
    $requestBody['password'] = \Nette\Utils\Random::generate(24);
    $requestBody['email'] = \Nette\Utils\Random::generate(24) . "@example.com";

    $transaction->request->body = json_encode($requestBody);
});

Hooks::after(CREATE_ACCOUNT_SUCCESSFUL, function (&$transaction) use ($context) {
    /**
     * @var Context $context
     */

    $body = $transaction->request->body;
    $request = json_decode($body);

    $username = $request->username;
    $email = $request->email;
    $password = $request->password;

    $user = $context->table("users")->where('username', $username)->fetch();

    if (!$user) {
        $transaction->fail = "Username does not match!";
    } else {
        if ($email != $user->email) {
            $transaction->fail = "Email does not match!";
        } else {
            if (!\Nette\Security\Passwords::verify($password, $user->password)) {
                $transaction->fail = "Password does not match!";
            }
        }
    }
});