It's nice to see you here, @ahaines-oysterll,
You can send invoices in QuickBooks but they aren't encrypted files. If your preference is sending coded files to clients, you will need to do it outside the program or use a third-party app to encrypt them.
We have a lot of third-party apps in our website that you can check. Click this link to find encryption tools to help you send the protected files to customers: https://quickbooks.intuit.com/app/apps/home/
We also have a separate forum called Intuit Developers, where you can find engineers who can help recommend third-party hosting applications to use. Click this link to our website: Intuit Developers Community.
If you have any more concerns about syncing applications with QuickBooks, feel free to post here again. I'll be right here to help you. Have a nice day!
