wery bad code _postPayment

payment.php

  <?php
    public function _postPayment( $data ) {

        
        $app =JFactory::getApplication();
        $html = "";

        $get = $app->input->get->get('status', false);

        if ( (bool) $get ) {
            $vars = new JObject();

            if ($app->input->get->getString('status') == self::STATUS_OK) {
                $vars->message = JText::_('J2STORE_CONFIRMED');
            } else {
                $vars->message = JText::_('J2STORE_FAILED');
            }
            $html = $this->_getLayout('postpayment', $vars);
        } else {
            $status = $this->getValidation($app->input);

            if($status === self::STATUS_OK) {
                if($this->setOrderStatus($app->input->getString('control'))) {
                    echo self::STATUS_OK;
                } else {
                    echo self::STATUS_FAIL;
                }
            } else {
                echo self::STATUS_FAIL;
            }

            $app->close();
        }
        return $html;
    }