diff --git a/generated_samples/interactive-tutorials/events/import_user_events_big_query.py b/generated_samples/interactive-tutorials/events/import_user_events_big_query.py
index 40821f8a78bf..42261f623399 100644
--- a/generated_samples/interactive-tutorials/events/import_user_events_big_query.py
+++ b/generated_samples/interactive-tutorials/events/import_user_events_big_query.py
@@ -13,9 +13,10 @@
 # limitations under the License.
 
 import argparse
-import os
 
-project_id = os.environ["GOOGLE_CLOUD_PROJECT"]
+import google.auth
+
+project_id = google.auth.default()[1]
 
 
 def main(project_id, dataset_id, table_id):
diff --git a/generated_samples/interactive-tutorials/events/import_user_events_gcs.py b/generated_samples/interactive-tutorials/events/import_user_events_gcs.py
index c9da3f85d05e..0c56987f305a 100644
--- a/generated_samples/interactive-tutorials/events/import_user_events_gcs.py
+++ b/generated_samples/interactive-tutorials/events/import_user_events_gcs.py
@@ -21,6 +21,7 @@ def main(bucket_name):
     # Import user events into a catalog from GCS using Retail API
 
     import time
+    import google.auth
 
     from google.cloud.retail import (
         GcsSource,
@@ -31,7 +32,7 @@ def main(bucket_name):
     )
 
     # Read the project number from the environment variable
-    project_id = os.getenv("GOOGLE_CLOUD_PROJECT")
+    project_id = google.auth.default()[1]
 
     # Read bucket name from the environment variable
     bucket_name = os.getenv("EVENTS_BUCKET_NAME")
diff --git a/generated_samples/interactive-tutorials/events/import_user_events_inline.py b/generated_samples/interactive-tutorials/events/import_user_events_inline.py
index 7c165a8d9b50..bdbaa72a3bfc 100644
--- a/generated_samples/interactive-tutorials/events/import_user_events_inline.py
+++ b/generated_samples/interactive-tutorials/events/import_user_events_inline.py
@@ -17,11 +17,12 @@
 # Import user events into a catalog from inline source using Retail API
 #
 import datetime
-import os
 import random
 import string
 import time
 
+import google.auth
+
 from google.cloud.retail import (
     ImportUserEventsRequest,
     UserEvent,
@@ -29,9 +30,10 @@
     UserEventInputConfig,
     UserEventServiceClient,
 )
+
 from google.protobuf.timestamp_pb2 import Timestamp
 
-project_id = os.getenv("GOOGLE_CLOUD_PROJECT")
+project_id = google.auth.default()[1]
 
 default_catalog = "projects/{0}/locations/global/catalogs/default_catalog".format(
     project_id
diff --git a/generated_samples/interactive-tutorials/events/purge_user_event.py b/generated_samples/interactive-tutorials/events/purge_user_event.py
index 31fef6f5906c..256ecde1e3a5 100644
--- a/generated_samples/interactive-tutorials/events/purge_user_event.py
+++ b/generated_samples/interactive-tutorials/events/purge_user_event.py
@@ -16,13 +16,13 @@
 # [START retail_purge_user_event]
 # Import user events into a catalog from inline source using Retail API
 #
-import os
+import google.auth
 
 from google.cloud.retail import PurgeUserEventsRequest, UserEventServiceClient
 
 from setup_events.setup_cleanup import write_user_event
 
-project_id = os.getenv("GOOGLE_CLOUD_PROJECT")
+project_id = google.auth.default()[1]
 
 default_catalog = "projects/{0}/locations/global/catalogs/default_catalog".format(
     project_id
diff --git a/generated_samples/interactive-tutorials/events/rejoin_user_event.py b/generated_samples/interactive-tutorials/events/rejoin_user_event.py
index 586c5ec813de..67e4caa585be 100644
--- a/generated_samples/interactive-tutorials/events/rejoin_user_event.py
+++ b/generated_samples/interactive-tutorials/events/rejoin_user_event.py
@@ -16,13 +16,13 @@
 # [START retail_rejoin_user_event]
 # Import user events into a catalog from inline source using Retail API
 #
-import os
+import google.auth
 
 from google.cloud.retail import RejoinUserEventsRequest, UserEventServiceClient
 
 from setup_events.setup_cleanup import purge_user_event, write_user_event
 
-project_id = os.getenv("GOOGLE_CLOUD_PROJECT")
+project_id = google.auth.default()[1]
 
 default_catalog = "projects/{0}/locations/global/catalogs/default_catalog".format(
     project_id
diff --git a/generated_samples/interactive-tutorials/events/setup_events/events_create_gcs_bucket.py b/generated_samples/interactive-tutorials/events/setup_events/events_create_gcs_bucket.py
index e1ccf829979c..00ff31a823e3 100644
--- a/generated_samples/interactive-tutorials/events/setup_events/events_create_gcs_bucket.py
+++ b/generated_samples/interactive-tutorials/events/setup_events/events_create_gcs_bucket.py
@@ -15,9 +15,11 @@
 import datetime
 import os
 
+import google.auth
+
 from setup_cleanup import create_bucket, upload_blob
 
-project_id = os.environ["GOOGLE_CLOUD_PROJECT"]
+project_id = google.auth.default()[1]
 timestamp_ = datetime.datetime.now().timestamp().__round__()
 bucket_name = os.environ["EVENTS_BUCKET_NAME"]
 
diff --git a/generated_samples/interactive-tutorials/events/setup_events/setup_cleanup.py b/generated_samples/interactive-tutorials/events/setup_events/setup_cleanup.py
index 6fa29ecd6b58..53dd775cb692 100644
--- a/generated_samples/interactive-tutorials/events/setup_events/setup_cleanup.py
+++ b/generated_samples/interactive-tutorials/events/setup_events/setup_cleanup.py
@@ -15,21 +15,22 @@
 
 import datetime
 import json
-import os
 import re
 import shlex
 import subprocess
 
 from google.api_core.exceptions import NotFound
+import google.auth
 
 from google.cloud import bigquery
 from google.cloud import storage
 from google.cloud.retail import ProductDetail, PurgeUserEventsRequest, \
     UserEvent, UserEventServiceClient, WriteUserEventRequest
 from google.cloud.retail_v2 import Product
+
 from google.protobuf.timestamp_pb2 import Timestamp
 
-project_id = os.getenv('GOOGLE_CLOUD_PROJECT')
+project_id = google.auth.default()[1]
 default_catalog = "projects/{0}/locations/global/catalogs/default_catalog".format(
     project_id)
 
diff --git a/generated_samples/interactive-tutorials/events/write_user_event.py b/generated_samples/interactive-tutorials/events/write_user_event.py
index 729848024d0d..cd02d7c9fb56 100644
--- a/generated_samples/interactive-tutorials/events/write_user_event.py
+++ b/generated_samples/interactive-tutorials/events/write_user_event.py
@@ -17,14 +17,16 @@
 # Import user events into a catalog from inline source using Retail API
 #
 import datetime
-import os
+
+import google.auth
 
 from google.cloud.retail import UserEvent, UserEventServiceClient, WriteUserEventRequest
+
 from google.protobuf.timestamp_pb2 import Timestamp
 
 from setup_events.setup_cleanup import purge_user_event
 
-project_id = os.getenv("GOOGLE_CLOUD_PROJECT")
+project_id = google.auth.default()[1]
 
 default_catalog = "projects/{0}/locations/global/catalogs/default_catalog".format(
     project_id