Streaming API Developer Guide

Getting Started with Streaming API
Code Examples
Client Connection Considerations
PushTopic Events (Legacy)
Working with PushTopics
PushTopic Considerations
PushTopic Event Publishing for PersonAccount
PushTopic Notification Message Order
Considerations for Multiple Notifications in the Same Transaction
PushTopic Streaming Allocations
Reference: PushTopic
Generic Events (Legacy)
Monitoring Event Usage
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PushTopic Event Publishing for PersonAccount

PushTopic only targets the Account record when publishing events for changes to a PersonAccount. Although a PersonAccount is internally composed of one Account record and one Contact record, changes to the Contact record are handled through the Account record with which it is associated in PushTopic event subscriptions. Therefore, PushTopic events are based solely on changes to the Account record.