To access your invoices log in and follow the steps below:
Dashboard > Settings > Payment > View Statement
You will then have the option to click view invoice for each order.
As an alternative, you may also view it from your dashboard by clicking on orders. Once you are within your orders page you will see on the right hand side actions with several icon options. Click on 
and the invoice will open for that order.
and the invoice will open for that order.