You can use
CustomerSyncService to retrieve the changed entities for a customer account within a given date range. The
GetAccountChanges Java example demonstrates how to retrieve the changes in the account in the last 24 hours. Code samples in other languages are available
here. I'm afraid detailed change history similar to AdWords UI is not available via AdWords API services. Please keep an eye on our
blog for any updates related to this feature.
Shwetha. AdWords API Team.