1// Register new shipping method
 2add_action( 'woocommerce_shipping_init', 'custom_shipping_method_init' );
 3function custom_shipping_method_init() {
 4    if ( ! class_exists( 'WC_Request_Shipping_Quote' ) ) {
 5        class WC_Request_Shipping_Quote extends WC_Shipping_Method {
 6 
 7            /**
 8             * Constructor for your shipping class
 9             *
10             * @access public
11             * @return void
12             */
13            public function __construct() {
14                $this->id                 = 'request_shipping_quote';
15                $this->method_title       = __( 'International Shipping Quote' );
16                $this->method_description = __( 'Allow customers who match the zone to receive a shipping cost before making payment.' );
17                $this->enabled            = "yes";
18                $this->title              = "Request Shipping Quote";
19                $this->tax_status         = 'none';
20                $this->init();
21            }
22 
23            /**
24             * Init your settings
25             *
26             * @access public
27             * @return void
28             */
29            function init() {
30                // Load the settings API
31                $this->init_form_fields();
32                $this->init_settings();
33                // Save settings in admin if you have any defined
34                add_action( 'woocommerce_update_options_shipping_' . $this->id, array( $this, 'process_admin_options' ) );
35            }
36 
37            /**
38             * calculate_shipping function.
39             *
40             * @access public
41             * @param mixed $package
42             * @return void
43             */
44            public function calculate_shipping( $package ) {
45                $rate = array(
46                    'id' => $this->id,
47                    'label' => $this->title,
48                    'cost' => 0,
49                    'calc_tax' => 'per_item'
50                );
51                // Register the rate
52                $this->add_rate( $rate );
53            }
54        }
55    }
56}
57 
58// Add the shipping method to WooCommerce
59add_filter( 'woocommerce_shipping_methods', 'add_request_shipping_quote_method' );
60function add_request_shipping_quote_method( $methods ) {
61    $methods['request_shipping_quote'] = 'WC_Request_Shipping_Quote';
62    return $methods;
63}
64 
65// Change "Request Shipping Quote" to a button
66add_filter( 'woocommerce_cart_shipping_method_full_label', 'custom_shipping_request_quote_label', 10, 2 );
67function custom_shipping_request_quote_label( $label, $method ) {
68    if ( $method->method_id == 'request_shipping_quote' ) {
69        $label = '<button type="button" class="button">Request Shipping Quote</button>';
70    }
71    return $label;
72}