diff --git a/OrderCloud.Integrations.Payment.PayPal/Mappers/PayPalOrderPaymentMapper.cs b/OrderCloud.Integrations.Payment.PayPal/Mappers/PayPalOrderPaymentMapper.cs
index 25e497e..27c3e9d 100644
--- a/OrderCloud.Integrations.Payment.PayPal/Mappers/PayPalOrderPaymentMapper.cs
+++ b/OrderCloud.Integrations.Payment.PayPal/Mappers/PayPalOrderPaymentMapper.cs
@@ -48,7 +48,7 @@ public List<PurchaseUnit> MapToPurchaseUnit(AuthorizeCCTransaction transaction,
                             },
                             description = transaction?.OrderWorksheet?.Order?.Comments,
                             reference_id = Guid.NewGuid().ToString(),
-                            invoice_id = Guid.NewGuid().ToString(),
+                            invoice_id = transaction?.OrderID,
                         };
                         if (address != null)
                         {