If you have WHMCS and Quickbooks, then you simply need this addon. It makes life so much easier. I was able to get almost everything set up in an hour. That included pushing all my old invoices over to quickbooks. The only thing that I couldn't get set up right away was the batch import (I use Stripe as a payment gateway). Peter went above and behind to help me get that last feature set up. Really good tool with great support.