In our current billing system we had a PHP program built to provide a downloadable csv file containing:
Customer, DisplayName, FirstName, Lastname, “Transaction Date”, RefNumber, Item, Quantity, Description, Price, BillEmail, BillAddrLine1, BillAddrCity, BillAddrState, ShipAddrPostalCode & PhoneNumber
We then use TransactionPro Importer to pull paid invoices into QuickBooks Desktop (QBD) as Sales Receipts. It works well.
I am planning on self-hosting Invoice Ninja, is there a code repository somewhere to help get our programmer started?