Within Teamwork Desk you can find all of the invoices for your subscription and payments details in the billing section

To view these  click on your profile icon to the top right of the navigation bar and select 'Settings':

In the settings area, go to the 'Billing' tab and select 'Billing History' from the left pane:

From here, all payment details can be viewed at a glance or a more detailed view can be accessed by clicking on 'View Invoice' to the right:

When viewing an invoice, you will also have an option to download it.

Note: Only administrators will have access to this area.