Thank you for your input, and I will try the Internal Only Invoice and see how well it works.

I just wanted to clarify that the 3rd party is not a payment provider.  My client has a photography business, and they are his lab, with which he has contracted.  Orders are placed and paid for through a website, and those orders are sent to the lab for immediate fulfillment.

The lab provides us with monthly reports, and we also have access to the raw data and can run any report that we might need.

Thanks

EJ