WooCommerce的成功URL是什么

我在网上使用WooCommerce，目前添加了一个网关插件。我只想问一下这个插件中的成功URL、取消URL和IPN URL是什么。让我们以www.domain.com为例。

这是代码：

add_action('plugins_loaded', 'woocommerce_FdBank_init', 0);
function woocommerce_FdBank_init() {
class WC_FdBank extends WC_Payment_Gateway {
    /*
     * consrtuct
     */
    public function __construct()
    {
        $url = includes_url();
        $this->id       = 'FdBank';
        // some code 
        $this->notify_url   = trailingslashit(home_url());
        add_action('woocommerce_update_options_payment_gateways_' . $this->id, array( $this, 'process_admin_options' ) );
        add_action('woocommerce_thankyou_FdBank', array(&$this, 'thankyou_page'));
        add_action('woocommerce_receipt_FdBank', array(&$this, 'receipt_page'));
        add_action('init', array(&$this, 'check_FdBank_response'));
    add_action( 'woocommerce_api_' . strtolower( get_class( $this ) ), array( $this, 'check_FdBank_response' ) );
    }//function construct
    /*
     * Fields for admin
     */
    public function init_form_fields()
    {
        // some code here 
    }//function init_form_fields
    /*
     * All resonses
     * are opereted here
     * +curl from pay server
     */
    public function check_FdBank_response()
    {
        global $woocommerce;

        ##gettin notify Data from pay server
        if($_SERVER['REQUEST_METHOD'] == 'POST'){
            $aData = $_POST;
            if (!empty($aData)) {
                $order_id = $aData['tran_id'];
                $order_id = preg_replace("/$this->user_code/", '', $order_id, 1);
                $order    = new WC_Order( $order_id );
                if($aData['Tran_Status'] == 'S' && $order->status == 'pending'){
                    $order->update_status('processing');
                    return;
                }
            }
        }
        ## fail Action
        $order_id = $aData['tran_id'];
        $order_id = preg_replace("/$this->user_code/", '', $order_id, 1);
        $order    = new WC_Order( $order_id );
        if($_POST['Tran_Status'] == 'F' || $_POST['Tran_Status'] == 'P'){
            if($order->status !=='completed'){
                if($order->status == 'processing'){
                } else {
                    $order -> update_status('failed');
                    $order -> add_order_note('Failed');
                    $order -> add_order_note("Payment failed in bank");
                    $redirect = $order->get_cancel_order_url();
                    return;
                }
            } else {
                wp_redirect($this->notify_url);
            }
        }//function check_FdBank_response
        ##Success Action
        if($_POST['Tran_Status'] == 'S'){
            if($order->status !=='completed'){
                if($order->status == 'processing'){
                    $order->payment_complete();
                    $order->update_status('completed');
                    $order->add_order_note('FdBank payment successful<br/>Bank Ref Number: '.$transid);
                    $order->add_order_note("Thank you for shopping with us. Your account has been charged and your transaction is successful. We will be shipping your order to you soon.");
                    $woocommerce->cart->empty_cart();
                    $abc = $this->get_return_url( $order );
                    wp_redirect($this->get_return_url( $order ));
                    return;
                }
            } else {
                $order -> update_status('failed');
                $order -> add_order_note('Failed');
                $order -> add_order_note("Payment failed in bank");
                $redirect = $order->get_cancel_order_url();
                wp_redirect($redirect);
                return;
            }
        }
    }
    /*
     * Gererating from fields
     */
    public function payment_fields()
    {
        if ($this->description){
            echo wpautop(wptexturize($this->description));
        }
    }//function payment_fields
    /*
     * thank you page
     */
    public function thankyou_page()
    {
        if ($this->description){
            echo wpautop(wptexturize($this->description));
        }
        ?><h2><?php _e('Our Details', 'woocommerce') ?></h2>
        <ul class="order_details ppay_details"><?php
        $fields = array(
            'ppay_number'=> __('FdBank ', 'woocommerce')
        );
        foreach ($fields as $key=>$value) :
            if(!empty($this->$key)) :
                echo '<li class="'.$key.'">'.$value.': <strong>'.wptexturize($this->$key).'</strong></li>';
            endif;
        endforeach;
        ?></ul><?php
    }//function thankyou_page
    /*
     * simple reciept
     */
    public function receipt_page($order)
    {
        echo '<p>'.__('Thank you for your order, please click the button below to pay with FdBank .', 'woocommerce').'</p>';
        echo $this->generate_FdBank_form( $order );
    }//function receipt_page
    /*
     * generate_FdBank_form
     * form
     */
    public function generate_FdBank_form( $order_id )
    {
        global $woocommerce;
        $order = new WC_Order( $order_id );
    $redirect_url = $order->get_checkout_order_received_url();
        $redirect_url = add_query_arg( 'wc-api', get_class( $this ), $redirect_url );
        $redirect_url = $redirect_url . '&res=1';

        $params = array(
            // some code 
        );
        $lr_args_array = array();
        foreach($params as $key => $value){
            $lr_args_array[] = "<input type='hidden' name='$key' value='$value'/>";
        }

        return '<form id="FdBank"  action="https://sandbox.domain.com/trans.aspx" method="POST" name="process" >' . implode('', $lr_args_array) . '
                        <input type="submit" class="button-alt button" id="submit_FdBank_payment_form" value="'.__('Pay FdBank ', 'woocommerce').'" /> <a class="button cancel" href="'.esc_url( $order->get_cancel_order_url() ).'">'.__('Cancel order &amp; restore cart', 'woocommerce').'</a>
                </form>';
    }//function generate_FdBank_form
    /*
     * proccess
     */
    public function process_payment( $order_id ) {
        global $woocommerce;
        $order = new WC_Order( $order_id );
        return array(
            'result'    => 'success',
            'redirect'  => add_query_arg('order', $order->id, add_query_arg('key', $order->order_key, get_permalink(woocommerce_get_page_id('pay'))))
        );
    }//function process_payment
}
    function woocommerce_add_FdBank_gateway($methods) {
        $methods[] = 'WC_FdBank';
        return $methods;
    }
    add_filter('woocommerce_payment_gateways', 'woocommerce_add_FdBank_gateway' );
}

如果check_FdBank_response是响应处理程序，那么URL是什么？交易后，网关会将用户重定向到哪个页面，因为我们没有发送任何带有参数的返回URL或取消URL？