Per the documentation, listAvailablePeriods can return next_page:
When present, a String specifying the URL for the next page of results.
The next page of results can be retrieved by issuing a GET request to this URL and you will receive a response in the same format as a regular read events request.
As far as I can see, there is no way to access this second page via this helper library.
Per the documentation, listAvailablePeriods can return
next_page:As far as I can see, there is no way to access this second page via this helper library.