Integration Challenges with Online Working Hour Calculators

I'm facing integration challenges while trying to incorporate an online working hour calculator into my existing workflow system. Specifically, I'm encountering issues with data synchronization and real-time updates between the calculator and other applications.

Has anyone successfully integrated a working hour calculator into their workflow? How did you overcome integration hurdles, and are there any tools or platforms you recommend for seamless integration? Any advice or best practices would be incredibly helpful.