To see an invoice history of any Firecracker subscription purchases, click “Account And Settings” tab from the left-hand side of your page, and scroll down to the Subscriptions section: https://app.firecracker.me/#/tree/settings
You may extend your subscription at any time; all time purchased will be automatically added to the time remaining in your subscription. Online at med.firecracker.me/purchase you can purchase Firecracker at a great rate!
We do not send receipts, and your credit card number is never stored on Firecracker servers. If you require a more official invoice or receipt for your subscription purchase, or if you'd like to inquire about possible discounts we may be able to offer, then just reach out to us at firstname.lastname@example.org and we will be happy to help you out with that.