You can find your invoices in your Account. Click on the button “Plan” Which is on the left.
Now you see the overview of your plan. You will find a field named “Invoices”, simply click on “view all”.
You will see all your Invoices, please note, that the status “successful” does not mean that the Invoice is paid, that simply means it was successfully sent to you.
If you want to download your invoice. Click on the desired invoice, then on the “Download Invoice” button, and voilà now you know where to find your invoices and how to download them.