/**
  * Returns true if on the pay page and this is the currently selected gateway
  *
  * @since 1.0
  * @return mixed true if on pay page and is currently selected gateways, false if on pay page and not the selected gateway, null otherwise
  */
 public function is_pay_page_gateway()
 {
     if (SV_WC_Plugin_Compatibility::is_checkout_pay_page()) {
         $order_id = SV_WC_Plugin_Compatibility::get_checkout_pay_page_order_id();
         if ($order_id) {
             $order = new WC_Order($order_id);
             return $order->payment_method == $this->get_id();
         }
     }
     return null;
 }