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
​
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, then just reach out to us at [email protected] and we will be happy to help you out with that.