WC_Shipping_Method::process_admin_options PHP Method

    public function process_admin_options()
    {
        if ($this->instance_id) {
            $this->init_instance_settings();
            $post_data = $this->get_post_data();
            foreach ($this->get_instance_form_fields() as $key => $field) {
                if ('title' !== $this->get_field_type($field)) {
                    try {
                        $this->instance_settings[$key] = $this->get_field_value($key, $field, $post_data);
                    } catch (Exception $e) {
                        $this->add_error($e->getMessage());
                    }
                }
            }
            return update_option($this->get_instance_option_key(), apply_filters('woocommerce_shipping_' . $this->id . '_instance_settings_values', $this->instance_settings, $this));
        } else {
            return parent::process_admin_options();
        }
    }

 /**
  * Process and redirect if disabled.
  */
 public function process_admin_options()
 {
     parent::process_admin_options();
     if ('no' === $this->settings['enabled']) {
         wp_redirect(admin_url('admin.php?page=wc-settings&tab=shipping&section=options'));
         exit;
     }
 }