Storrito is sold through our reseller Paddle.com, which handles tax compliance for us so we can sell Storrito worldwide.
You can download your invoices on the Subscription page inside the Storrito app (open Subscription in the sidebar).
Click Invoices next to your recent transactions, then select the invoice you want to download:

Paddle will also email you your invoices. Make sure to check your spam folder if you don't see the email. Inside the email, you'll find a View invoice button. Clicking on it will open your invoice in your web browser.
Paddle will soon offer the option to download your invoice as a PDF. For now, we recommended using your browser's print-to-PDF feature to save your invoices: