We send you an invoice every time you are billed to the admin email.
You can also view your invoices in Schedugram.
Go to "Profile/billing settings" then click "subscription" on the right hand side. 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.