Hello Chirag,
The
CustomerSyncService will return the changed entities for a customer account or campaign based on the given date range within the last 90 days. However, please note that this will only return the changes at the Campaign level, AdGroup level along with the changed criteria Ids. If you're looking to pull audience status changes through the API, I'm afraid it is currently not possible to do so. You may use the change history to check the changes from the web interface as an alternative.
Thanks,
Bharani, AdWords API Team