Via the Piano dashboard
To obtain a list of your users' addresses through the dashboard, simply navigate to the Subscription Details Report (Reports → Logs → Subscriptions → Download). The resulting report will be shown in the Download center. It is a CSV containing details on each subscription linked with your application, with the relevant subscriptions also including user addresses.
Via the Piano API library
You can also automatically generate a list of your users' addresses via Piano's REST API library. To do so, you will need the /publisher/subscription/list endpoint, syntax for which can be found here. Specifically, you are looking for the UserAddress object within the response, which will be populated for any users that have an address associated with their subscriptions.