Checkout Cart Redirect Help

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Hello everyone, here is my situation:

I need to redirect customers from one Website ( Website 1) to another website (Website 2) where they enter checkout details. I need the cart items to transfer over from Website 1 to Website 2. I’ve tried to implement a custom plug in to do this, but it refuses to actually transfer the products over. Something pehaps to do with API’s? I have pasted the code below. Please help, thank you.

<?php
/*
Plugin Name: WooCommerce Redirect to External Checkout
Description: Redirects the customer to an external site’s checkout page with items pre-added to the cart.
Version: 1.0
Author: Your Name
*/

if (!defined(‘ABSPATH’)) {
    exit; // Exit if accessed directly
}

class WC_Redirect_To_External_Checkout
{
    private $product_id_map;

    public function __construct()
    {
        // Initialize the product ID mapping array
        $this->product_id_map = array(
            // WooCommerce product ID => External site product ID
            2082 => 843,
            2081 => 840,
            1898 => 685,
            1880 => 672,
            1790 => 478,
            1789 => 480,
            1315 => 124,
            1316 => 121,
            1078 => 123,
            1064 => 120,
            774 => 122,
            789 => 119,
            258 => 116,
            173 => 113,
            257 => 117,
            174 => 114,
            256 => 118,
            172 => 115,
            1460 => 93,
            1459 => 94,
            1458 => 111,
            832 => 112,
            2091 => 1153,
            // Add more mappings as needed
        );

        add_action(‘template_redirect’, array($this, ‘redirect_to_external_checkout’));
    }

    public function redirect_to_external_checkout()
    {
        if (is_checkout() && !is_wc_endpoint_url(‘order-received’)) {
            $cart = WC()->cart->get_cart();

            // Check if cart is empty
            if (empty($cart)) {
                wc_add_notice(__(‘Your cart is empty.’, ‘woocommerce’), ‘error’);
                return;
            }

            $external_cart_data = array();

            foreach ($cart as $cart_item_key => $cart_item) {
                $product_id = $cart_item[‘product_id’];
                $quantity = $cart_item[‘quantity’];

                // Check if the product ID exists in the mapping array
                if (isset($this->product_id_map[$product_id])) {
                    $external_product_id = $this->product_id_map[$product_id];
                    $external_cart_data[] = array(
                        ‘product_id’ => $external_product_id,
                        ‘quantity’   => $quantity,
                    );
                } else {
                    // Handle the case where the product ID is not mapped
                    wc_add_notice(__(‘One or more products in your cart cannot be processed. Please contact support.’, ‘woocommerce’), ‘error’);
                    WC()->cart->empty_cart();
                    return;
                }
            }

            // Generate the external checkout URL with cart data as query parameters
            $external_checkout_url = ‘EXTERNAL CHECKOUT LINK’; // Replace with your external site’s checkout URL
            $external_cart_query = http_build_query(array(‘cart’ => $external_cart_data));
            $external_checkout_url = add_query_arg(‘cart’, urlencode(json_encode($external_cart_data)), $external_checkout_url);

            // Redirect to the external site’s checkout page
            wp_redirect($external_checkout_url);
            exit;
        }
    }
}

new WC_Redirect_To_External_Checkout();

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