QB Issue Resolution:
You can use the QuickBooks SDK, info found at https://developer.intuit.com/docs/0200_quickbooks_desktop/0100_essentials/0000_overview#/813
Note that this is very complicated to work with, there are a lot of tricky issues there (I am a QBSDK developer myself). The standard QBSDK is set up for a desktop app. There is a “web connector” if you need to integrate a web app, but that has a number of drawbacks.
You can use third-party tool that makes things easier, in general. Probably the most widely used would be the QODBC driver. Find info on that at https://desktop.apps.com/apps/136953#!overview. That provides you with ODBC connectivity, which is more easily understood by most developers, and that gets around a lot of the very odd QBSDK quirks. The QODBC website has a great reference to the fields/tables that are available in QuickBooks.
There are some other third-party toolkits that provide layers on top of the QBSDK that people use, but I’ve not worked with any of those so I can’t comment on them.
Resolution for Issue 'How to integrate our business systems with QuickBooks Premier 2016 (Desktop version)' available: Yes (Solved).
Source: Intuit Community forum.
How to integrate our business systems with QuickBooks Premier 2016 (Desktop version): this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.Support for business systems
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