diff --git a/libs/common/src/lib/interfaces/coupon.interface.ts b/libs/common/src/lib/interfaces/coupon.interface.ts
index cbf8525a2..0ee1ddb24 100644
--- a/libs/common/src/lib/interfaces/coupon.interface.ts
+++ b/libs/common/src/lib/interfaces/coupon.interface.ts
@@ -2,5 +2,6 @@ import { StringValue } from 'ms';
 
 export interface Coupon {
   code: string;
-  duration?: StringValue;
+  createdAt: string;
+  duration: StringValue;
 }