Hi ,
I have experience posting journal entries into Quickbooks desktop app via the COM XML API, and can do the same for you.
My recommendation is to develop a desktop app in VB.NET that will download your sales data from you sales website, and then connect directly to the Quickbooks instance (locally) and post the transactions.
Estimate for delivery is 10 days or less. Good quality work done.
Thanks for considering my bid.
Best wishes,
Steve