How to export the billing period?
You can export the billing period and other subscription-related information from the ‘Export Data’ option.
Navigate to Settings > Import & Export Data > Export Data > Subscriptions > Select criteria to export
You can set filters as per your business requirements and Export.
Once exported, you will see a zipped folder with the list of CSV files. Look for Subscription.csv and you can find the relevant information.
You can also import this from the Subscription section, you will also have filters for your search criteria, screenshot for reference.