---
schema_version: "1"
id: f1224521e011caf509250274b3b7d78ab07f6989c039262ea6b697dfbd18a5ae
title: Subscribe to Change Events
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/platform/264-0-0/external_object_change_tracking_subscribe.md
canonical_url: https://help.salesforce.com/s/articleView?id=platform.external_object_change_tracking_subscribe.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: 375bbc94cc26fe8a3433a2cf0ab268b580465333cf973d9a9a52fcffb5c9960f
description: You can use Apex triggers to subscribe to change events. Or you can use a Bayeux client to subscribe to Streaming API on the publication channel.
products:
  - Salesforce Platform
  - Security
release: "264"
---
# Subscribe to Change Events

You can use Apex triggers to subscribe to change events. Or you can use a Bayeux client to subscribe to Streaming API on the publication channel.

After subscribing, you can observe change event notifications when you perform a DML operation on an external object. You can also see change events on the tracked data stored on the external system.