Fix Quick books Invoice Integration in .net

I am in need of a freelancer who can fix the QuickBooks invoice integration in .net. Specifically, I am unable to generate invoices due to syncing issues. I am using QuickBooks Online for my business and require a fix for the current issue only.

Ideal Skills and Experience:
- Strong experience with QuickBooks invoice integration in .net
- Proficient in QuickBooks Online
- Ability to troubleshoot and resolve syncing issues
- Familiarity with .net programming language
- Attention to detail and ability to deliver timely solutions