I've developed a Web Service in my software-as-a-service application for interacting with the Quickbooks Web Connector.
One of the things that I found during development was that different versions of QuickBooks have different versions of XML Schemas. So, the application was developed to be flexible enough to accomodate various schemas.
Two questions: - Where are these fully documented? - How do I test the various [selected] versions without purchasing and maintaining all of the various versions of QuickBooks?