In the Control Panel, you can view all account transactions of your user account. This includes, for example, credit top-ups, payments, and past invoices.
Log in to the Control Panel and open Account → Account Transactions.

In this overview, you can see all financial activities of your account.
You can filter the account transactions by calendar year, export them as a .csv file, or print them.
Credits are shown in black. Debits, for example from a stored payment method or from the credit balance, are shown in red.