diff --git a/payment/src/main/java/org/killbill/billing/payment/api/DefaultPaymentApi.java b/payment/src/main/java/org/killbill/billing/payment/api/DefaultPaymentApi.java
index 07c4669..394320d 100644
--- a/payment/src/main/java/org/killbill/billing/payment/api/DefaultPaymentApi.java
+++ b/payment/src/main/java/org/killbill/billing/payment/api/DefaultPaymentApi.java
@@ -292,7 +292,7 @@ public class DefaultPaymentApi extends DefaultApiBase implements PaymentApi {
checkNotNullParameter(amount, "amount");
checkNotNullParameter(currency, "currency");
}
- checkNotNullParameter(paymentTransactionExternalKey, "paymentTransactionExternalKey");
+
checkNotNullParameter(properties, "plugin properties");
if (paymentMethodId == null && !paymentOptions.isExternalPayment()) {