diff --git a/src/v0/sources/revenuecat/transform.js b/src/v0/sources/revenuecat/transform.js
index 36944e10fa..0491fb3270 100644
--- a/src/v0/sources/revenuecat/transform.js
+++ b/src/v0/sources/revenuecat/transform.js
@@ -1,6 +1,7 @@
 const { camelCase } = require('lodash');
 const moment = require('moment');
 const { removeUndefinedAndNullValues, isDefinedAndNotNull } = require('../../util');
+const { generateUUID } = require('../../util');
 const Message = require('../message');
 
 function process(event) {
@@ -9,6 +10,11 @@ function process(event) {
   // we are setting event type as track always
   message.setEventType('track');
 
+  message.userId = event?.event?.app_user_id || event?.event?.original_app_user_id || '';
+  if (!isDefinedAndNotNull(message.userId)) {
+    message.anonymousId = generateUUID();
+  }
+
   const properties = {};
   // dump all event properties to message.properties after converting them to camelCase
   if (event.event) {
diff --git a/test/integrations/sources/revenuecat/data.ts b/test/integrations/sources/revenuecat/data.ts
index 4963781763..5da8a37728 100644
--- a/test/integrations/sources/revenuecat/data.ts
+++ b/test/integrations/sources/revenuecat/data.ts
@@ -144,6 +144,7 @@ export const data = [
                     type: 'TEST',
                   },
                   event: 'TEST',
+                  userId: 'f8e14f51-0c76-49ba-8d67-c229f1875dd9',
                   messageId: '8CF0CD6C-CAF3-41FB-968A-661938235AF0',
                   originalTimestamp: '2023-10-29T22:06:57.232Z',
                   sentAt: '2023-10-29T22:06:57.232Z',
@@ -272,6 +273,7 @@ export const data = [
                     type: 'INITIAL_PURCHASE',
                   },
                   event: 'INITIAL_PURCHASE',
+                  userId: 'yourCustomerAppUserID',
                   messageId: 'UniqueIdentifierOfEvent',
                   originalTimestamp: '2020-06-02T18:17:35.319Z',
                   sentAt: '2020-06-02T18:17:35.319Z',