In order to to get invoices upon your RegNow order:

1. Follow the link below:
https://www.regnow.com/order_lookup.html
You can find this link in your confirmation e-mail as well.

You'll see Order Lookup page

To locate your order you need to enter your email address and your order ID (see your order confirmation e-mail), and press "Search For My Order" button.

2. On Order Status Page find the link [Receipt] to get your Invoice. 

3. You'll see your Invoice.