Magento自定义结账模块删除发货地址和方法

我正在尝试为MAGENTO CHECKOUT创建一个自定义模块，我想在其中删除SHIPPING ADDRESS AND SHIPPING METHOD步骤。

所以我的代码如下：

app/etc/Mona_Test.xml

<?xml version="1.0"?>
<config>
  <modules>
    <Mona_Test>
      <active>true</active>
      <codePool>local</codePool>
    </Mona_Test>
   </modules>
</config>

app/code/local/Mona/Test/etc/config.xml

<?xml version="1.0"?>
<config>
  <modules>
    <Mona_Test>
        <version>1.0</version>
    </Mona_Test>
  </modules>
  <global>
    <frontend>
        <routers>
            <checkout>
                <args>
                    <modules>
                        <Mona_Test before="Mage_Checkout">Mona_Test</Mona_Test>    
                    </modules>    
                </args>
            </checkout>
        </routers>
    </frontend>
    <blocks>
        <test>
            <class>Mona_Test_Block</class>
        </test>
        <checkout>
            <rewrite>
                <onepage_abstract>Mona_Test_Block_Onepage_Abstract</onepage_abstract>
            </rewrite>
        </checkout>
    </blocks>
    <models>
        <test>
            <class>Mona_Test_Model</class>
        </test>
        <checkout>
            <rewrite>
                <type_onepage>Mona_Test_Model_Type_Onepage</type_onepage>
            </rewrite>
        </checkout>
    </models>
  </global>
</config>

app/code/local/Mona/Test/Blocks/Onepage/Abstract.php

 <?php  
 class Mona_Test_Block_Onepage_Abstract extends Mage_Checkout_Block_Onepage_Abstract {
protected function _getStepCodes()
{
    return array('login', 'billing', 'payment', 'review');
}
}  

？>

app/code/local/Mona/Test/controllers/OnepageController.php

<?php
 require_once 'Mage/Checkout/controllers/OnepageController.php';
  class Mona_Test_OnepageController extends Mage_Checkout_OnepageController
 {
    protected $_sectionUpdateFunctions = array(
      'payment-method' => '_getPaymentMethodsHtml',
      'review' => '_getReviewHtml',
    );
public function saveBillingAction()
{
    if ($this->_expireAjax()) {
        return;
    }
    $data = $this->getRequest()->getPost('billing', array());
    $customerAddressId = $this->getRequest()->getPost('billing_address_id', false);
    if (isset($data['email'])) {
        $data['email'] = trim($data['email']);
    }
    $result = $this->getOnepage()->saveBilling($data, $customerAddressId);
    if (!isset($result['error'])) {
        /* check quote for virtual */
        if ($this->getOnepage()->getQuote()->isVirtual()) {
            $result['goto_section'] = 'payment';
            $result['update_section'] = array(
                'name' => 'payment-method',
                'html' => $this->_getPaymentMethodsHtml()
            );
        } else {
            $result['goto_section'] = 'payment';
        }
    }
    $this->getResponse()->setBody(Mage::helper('core')->jsonEncode($result));
}
public function saveShippingAction()
{
    if ($this->_expireAjax()) {
        return;
    }
    if ($this->getRequest()->isPost()) {
        $data = $this->getRequest()->getPost('shipping', array());
        $customerAddressId = $this->getRequest()->getPost('shipping_address_id', false);
        $result = $this->getOnepage()->saveShipping($data, $customerAddressId);
        if (!isset($result['error'])) {
            $result['goto_section'] = 'payment';
            $result['update_section'] = array(
                'name' => 'payment-method',
                'html' => $this->_getShippingMethodsHtml()
            );
        }
        $this->getResponse()->setBody(Mage::helper('core')->jsonEncode($result));
    }
}

}

app/code/local/Mona/Test/Model/Type/Onepage.php

<?php
class Mona_Test_Model_Type_Onepage extends Mage_Checkout_Model_Type_Onepage
{
    public function saveShippingMethod($shippingMethod)
    {
        if (empty($shippingMethod)) {
            $shippingMethod = 'freeshipping_freeshipping';
        }
        $rate = $this->getQuote()->getShippingAddress()->getShippingRateByCode($shippingMethod);
        if (!$rate) {
            return array('error' => -1, 'message' => Mage::helper('checkout')->__('Invalid shipping method.'));
        }
        $this->getQuote()->getShippingAddress()
            ->setShippingMethod($shippingMethod);
        $this->getCheckout()
            ->setStepData('shipping_method', 'complete', true)
            ->setStepData('payment', 'allow', true);
        return array();
    }
}

？>

它不起作用。我还应该做什么？任何解决方案都将是伟大的。