The Finance section stores your complete payment history and provides access to invoices. Open it via the profile menu (avatar in the sidebar → Finance).
At the bottom of the Finance section there is a table with all payments. Each entry contains:
If there are many payments, use the page navigation to browse earlier entries.

Payment history
Each payment in the table has a download button (download icon). Click it to download the invoice for that specific transaction.
If an automatic charge does not go through, check the following:
You can link a different card or update the current one in Finance → Payment Method. If the problem persists, contact support at [email protected].