diff --git a/src/inapp/types.ts b/src/inapp/types.ts
index 56e52535..faa9b146 100644
--- a/src/inapp/types.ts
+++ b/src/inapp/types.ts
@@ -50,7 +50,7 @@ export interface InAppMessage {
     };
     webInAppDisplaySettings: WebInAppDisplaySettings;
   };
-  customPayload: Record<string, any>;
+  customPayload?: Record<string, any>;
   trigger: { type: string };
   saveToInbox: boolean;
   inboxMetadata: {