does QuickBook Time support authentication via Winforms or I would have to create a webapp

Thanks for checking in with us, miheer.

When it comes to authentication of QuickBooks Time via Winforms, it would be best to contact Winforms technical support to help you with this one. 

If they don't support it, you'll want to check for a third-party application that can help you with the authentication process. Check out this link for a list of QuickBooks-compatible apps: https://quickbooks.intuit.com/app/apps/home/. We can also do it in QBO by following the steps below:

1. Go to Apps on the left side menu.
2. Search for the app in the Find apps to streamline your work field.
3. Look for an app that supports the Batch feature.

Any questions about integrating the app into your Online account should be directed to the app's third-party provider. Additionally, I've included these resources that'll help you review your employees' timesheets before running payroll. This way, you can ensure the approved hours are accurate:

• Approvals in QuickBooks Time
• Approve or Unapprove QuickBooks Time Hours from QuickBooks Online

Feel free to get back here in the Community space if you have any additional QuickBooks Time-related concerns. I'll be here to help you out.