Create order dynamically in woocommerce

functions.php

<?php 
/*
 * Create order dynamically
 */
function create_order_dynamically() {
    $customer_email = '[email protected]';
    $customer_address = array(
        'first_name' => 'Peter',
        'last_name'  => 'Parker',
        'company'    => '',
        'email'      => $customer_email,
        'phone'      => '9876543210',
        'address_1'  => 'Queens',
        'address_2'  => '', 
        'city'       => 'New York City',
        'state'      => 'New York',
        'postcode'   => '12345',
        'country'    => 'US'
    );

    $default_password = wp_generate_password();
    if (!$user = get_user_by('login', $customer_email)) $user = wp_create_user( $customer_email, $default_password, $customer_email );

    // Add your product as item products for order
    $order_item = 12; // keep in mind these product must exists
    $product = wc_get_product($order_item);
        
    // get product's shipping class
    $shipping_class = get_term_by('slug', $product->get_shipping_class(), 'product_shipping_class');

    WC()->shipping->load_shipping_methods();
    $shipping_methods = WC()->shipping->get_shipping_methods();

    $selected_shipping_method = $shipping_methods['free_shipping'];

    $class_cost = $selected_shipping_method->get_option('class_cost_' . $shipping_class->term_id);

    // Now create your order
    $order = wc_create_order(array('customer_id' => $user->ID));
    $order->add_product( $product, $quantity = 1);
    $order->set_address( $customer_address, 'billing' );
    $order->set_address( $customer_address, 'shipping' );

    $order->add_shipping((object)array (
        'id' => $selected_shipping_method->id,
        'label'    => $selected_shipping_method->title,
        'cost'     => (float)$class_cost,
        'taxes'    => array(),
        'calc_tax'  => 'per_order'
    ));

    $order->calculate_totals();
    $order->update_status("completed", 'Order dynamically created!', TRUE);
}