лампочка на мат.плате горит
use Bitrix\Sale;
$orderId = $_GET('ORDER_ID');
$order = Sale\Order::load($orderId);
$propertyCollection = $order->getPropertyCollection();
$emailPropValue = $propertyCollection->getUserEmail();
<script>
var ORDER = '<?php echo $orderId;?>';
var EMAIL = '<?php echo $emailPropValue;?>';
........
"merchant_id": мой id,
"order_id": ORDER,
"email": EMAIL,
"delivery_country": "знаю",
"estimated_delivery_date": "знаю",
.....
</script>