At this point, you cannot see billing history or receipts for your monthly charge. You do get an email advising you of the charge though. If you need a more detailed tax receipt, just ask for it via the pink chat button at the bottom of the screen and we'll send you a copy. You can also email email@example.com if you prefer.
We do intend to provide this function to you through the app interface in the future, but at this time, we believe our time is best spent on building out core Timblee functionality to make it more valuable and useful.