We send you an invoice every time you are billed to the administrator email (you can add extra invoices like your accounts department to be CC'd in the subscription section found below).
You can also view your invoices in your dashboard.
Go to "Settings" then click "Subscription & Billing" on the top. You will see a "view invoices" section - open this up and click the button to view all of your invoices.
Note that you need to be the account administrator (not a collaborator) to be able to view invoices.
If you are still in your trial, you won't have any invoices yet of course.
If you have changed currency, your 'old currency' invoices won't be listed there. Have a look in your email inbox, or email us to get a copy.