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en fait dans le controller il faut assigner mes valeurs:

puis dans le smarty je les reutilise orderCondirmationController.php

      $this->context->smarty->assign(array(
            'HOOK_ORDER_CONFIRMATION' => $this->displayOrderConfirmation($order),
            'HOOK_PAYMENT_RETURN' => $this->displayPaymentReturn($order),
            'order' => $presentedOrder,
            'register_form' => $register_form,
		'id_order' => $order->id,
		'total'=>$order->total_paid,
        ));

et dans le template order-confirmation.tpl

{literal}
<script>
  gtag('event', 'conversion', {
      'send_to': 'AW-XXXXXXXX/YYYYYYYYY',
      'value': {/literal}{$total|string_format:"%.2f"}{literal},
      'currency': 'EUR',
      'transaction_id': '{/literal}{$id_order}{literal}'
  });
</script>
{/literal}

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