You can obtain copies of your invoices and your check-in history from iBlink. Just go to www.blinkfitness.com to log in or register for iBlink, you'll find the option to obtain this information under the 'Member Info' tab.
You can also get a copy of your year to date check-in history automatically emailed to you via the Blink App. Open up the app and go to your profile to get your check-in data today!