diff --git a/src/response/MasterpassPaymentThreeDSInitResponse.ts b/src/response/MasterpassPaymentThreeDSInitResponse.ts
index d0a2dad..085b097 100644
--- a/src/response/MasterpassPaymentThreeDSInitResponse.ts
+++ b/src/response/MasterpassPaymentThreeDSInitResponse.ts
@@ -1,4 +1,5 @@
 type MasterpassPaymentThreeDSInitResponse = {
+  paymentId: number;
   returnUrl: string;
 };