Thanks for posting your concern in the Community. I'm here to guide you to the right support who can better assist you with this kind of concern.
There's a community dedicated to developers and integrating other websites with QuickBooks. I recommend that you sign up and post this question to our separate online forum called Intuit Developer Community.
This site contains resources for software development, as well as the ability to ask fellow developers questions. Our Intuit Developer can provide you with the utmost help to fix the errors you're having.
You can find additional information about this through this link: Intuit Developer.
I'll be here if you need more help with QuickBooks. Have a great day.