To view your invoices, go to: My Account > Billing and Password. Click on the "Invoices" tab to see all of your invoices and payment history. You can also view and print individual invoices that display the amount paid and the date they were paid.
Multi-User Plans have consolidated billing and only the plan Administrator will see this information in their billing history. Individual users in that plan will not see invoices. Only administrators can view their multi-plan invoices.