protected function verifyAccount($accountId)
    {
        //~ Verify if account is for current user, else throw error 500
        $mapper      = new AccountUserMapper(Database::get('money'));
        $accountUser = $mapper->findByKeys(array('user_id' => Session::getInstance()->get('id'), 'account_id' => $accountId));
        return $accountUser->getAccount();
    }