如何在woocommerce中添加iframe付款网关？

Question

我正在尝试在结帐页面上添加另一种WooCommerce付款方式，称为xxxx银行网关，并且选择该付款方式后，将加载如下所示的iframe（该iframe将重定向到银行网站，称为$ url）。

如何声明将在Checkout选项下显示的内容？

//Frontend: 
<input id="payment_method_xxxx" type="radio" class="input-radio" name="payment_method" value="xxxx" data-order_button_text="">
<label for="payment_method_xxx">
        xxx Payment     </label>

到目前为止，这是我的代码：

<?php
/*
Plugin Name: xxxxxxx WooCommerce Payment Gateway
Plugin URI: http://www.xxxxxxx.com/
Description: xxxxxxx enables merchants to authorize, settle and manage credit card and electronic check transactions via Web sites, retail stores, mail order/telephone order (MOTO) call centers and mobile devices.
Version: 1.0.0
*/

if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

/*
 * This action hook registers our PHP class as a WooCommerce payment gateway
 */
add_filter( 'woocommerce_payment_gateways', 'xxxxxxx_add_gateway_class' );
function xxxxxxx_add_gateway_class( $gateways ) {
    $gateways[] = 'WC_xxxxxxx_Gateway'; // your class name is here
    return $gateways;
}


/*
 * The class itself, please note that it is inside plugins_loaded action hook
 */
 add_action( 'plugins_loaded', 'xxxxxxx_init_gateway_class' );

function xxxxxxx_init_gateway_class() {
    class WC_xxxxxxx_Gateway extends WC_Payment_Gateway {

        /**
        * Constructor
        */
        public function __construct() {

            // global ID
            $this->id = 'xxxxxxx'; // payment gateway plugin ID

            $this->icon = ''; // URL of the icon that will be displayed on checkout page near your gateway name
            $this->has_fields = true; // in case you need a custom credit card form
            // Show Title
            $this->method_title = 'xxxxxxx Gateway';
            // Show Description
            $this->method_description = 'Description of xxxxxxx payment gateway'; // will be displayed on the options page      
            // setting defines
            $this->init_form_fields();
            $this->init_settings();

            $this->title        = $this->get_option( 'title' );
            // further check of SSL if you want
            //add_action( 'admin_notices', array( $this,    'do_ssl_check' ) );
            // This action hook saves the settings
            add_action( 'woocommerce_update_options_payment_gateways_' . $this->id, array( $this, 'process_admin_options' )); 

        }

        public function init_form_fields(){

                $this->form_fields = array(
                    'enabled' => array(
                        'title'       => 'Enable/Disable',
                        'label'       => 'Enable Epcipay Gateway',
                        'type'        => 'checkbox',
                        'description' => '',
                        'default'     => 'no'
                        ),
                    'title' => array(
                        'title' => __( 'Title', 'woocommerce' ),
                        'type' => 'text',
                        'description' => __( 'This controls the title which the user sees during checkout.', 'woocommerce' ),
                        'default' => __( 'xxxxxxx Payment', 'woocommerce' ),
                        'desc_tip'      => true,
                            ),
                    'description' => array(
                        'title' => __( 'Description', 'woocommerce' ),
                        'type' => 'textarea',
                        'default' => ''
                            ),
                    'terminal_id' => array(
                        'title'       => 'Terminal Id',
                        'type'        => 'text'
                        ),
                    'api_key' => array(
                        'title'       => 'API Key',
                        'type'        => 'password',
                        ),
                    'password' => array(
                        'title'       => 'Password',
                        'type'        => 'text'
                        ),
                    'pageid' => array(
                        'title'       => 'Page Id',
                        'type'        => 'text'
                        )
                );

            }

public function payment_fields() {
 //how to add script tag to show the hosted checkout 
// credit card form loaded from third party server -- Iframe
}
}