diff --git a/pay-java-paypal/src/main/java/com/egzosn/pay/paypal/api/PayPalPayService.java b/pay-java-paypal/src/main/java/com/egzosn/pay/paypal/api/PayPalPayService.java
index 9d26cf5ebcc2bde4379821bbe0d87a0181b7e699..d375df69e16f156e45535e1bd65a16224cd18e7f 100644
--- a/pay-java-paypal/src/main/java/com/egzosn/pay/paypal/api/PayPalPayService.java
+++ b/pay-java-paypal/src/main/java/com/egzosn/pay/paypal/api/PayPalPayService.java
@@ -195,7 +195,7 @@ public class PayPalPayService extends BasePayService<PayPalConfigStorage> {
             transaction.setDescription(order.getBody());
         }
         transaction.setAmount(amount);
-
+        transaction.setCustom(order.getOutTradeNo());
         List<Transaction> transactions = new ArrayList<>();
         transactions.add(transaction);