diff --git a/cmd/checkout/pool-server.go b/cmd/checkout/pool-server.go
index 4f50d1c..53dc20f 100644
--- a/cmd/checkout/pool-server.go
+++ b/cmd/checkout/pool-server.go
@@ -408,7 +408,7 @@ func (s *CheckoutPoolServer) GetPaymentSessionHandler(w http.ResponseWriter, r *
 			}
 		}
 		service := s.adyenClient.Checkout()
-		req := service.PaymentsApi.GetResultOfPaymentSessionInput(payload.SessionId)
+		req := service.PaymentsApi.GetResultOfPaymentSessionInput(paymentId)
 		if payload != nil {
 			req = req.SessionResult(payload.SessionResult)
 		}