I am developing a .Net client application that will integrate to the customer's QuickBooks Online (QBO) and the customer's synced desktop data (QBD).
Can I use QBXML? Is this still supported by Intuit? If so, how do I get an App Login and App ID for my new application? Are these still available to new developers?
If I need to use the .NET SDK for REST v2.0, how do my Customers get the Access Token and the Access Token Secret string values if the app is not web based? I understand how this works with oAuth CallBacks from a web app but how does this work from a fat client .Net app? I have attempted to connect using "oob" for out of band callbacks, but this results in an error during the final phase of authenticating on the Intuit web site.