Extend WC_Stripe_Webhook_Handler to override the check_for_webhook function

class-extend-woocommerce-stripe-webhook-handler.php

<?php

/**
 * Extend WC_Stripe_Webhook_Handler and override the check_for_webhook function
 *
 */

if (!class_exists('My_Stripe_Webhook_Handler')) :

    class My_Stripe_Webhook_Handler extends WC_Stripe_Webhook_Handler {

        public function __construct() {
            parent::__construct();

            // child filter
            add_action('woocommerce_api_wc_stripe', array($this, 'check_for_webhook'), 9);
        }

        public function check_for_webhook() {
            error_log('DEBUG WOO-HOO!!!! Entered child version. Modify however you like.');
            if (('POST' !== $_SERVER['REQUEST_METHOD'])
                || !isset($_GET['wc-api'])
                || ('wc_stripe' !== $_GET['wc-api'])
            ) {
                return;
            }

            $request_body = file_get_contents('php://input');
            $request_headers = array_change_key_case($this->get_request_headers(), CASE_UPPER);

            // Validate it to make sure it is legit.
            if ($this->is_valid_request($request_headers, $request_body)) {
                error_log('DEBUG: TO-DO Now examine the request_body');
                $this->process_webhook($request_body);
                status_header(200);
                exit;
            } else {
                WC_Stripe_Logger::log('Incoming webhook failed validation: ' . print_r($request_body, true));
                status_header(400);
                exit;
            }
        }

    }

endif; // class_exists check

new My_Stripe_Webhook_Handler();