In Elastic Path Commerce Cloud, every change to a user’s personal data is logged.
Personal data sets are groups of data items that are related to each other. For example, customer, addresses, and authentication information. The contents of a personal data set is dynamic. Data items are attached to each other automatically as they are created or updated.
The API allows you to fetch these logs, including the list of related data items. In other words, the data items that belong to the same personal data set.