Hi there, premkumarsf269.

Let me get you to the right support team currently handling QBO API concerns. Our support team has a dedicated group of developers who are experienced in QBO API concerns and can assist you with generating a new refresh token in the API. Let me connect you with them so they can provide further guidance and assistance.
 

Here's how you can reach them:

1. Visit this link: https://developer.intuit.com/app/developer/homepage.
2. Scroll down, and at the bottom, click Contact Us under the Intuit column.
3. Select a topic from What do you need help with?
4. Click Ask a Question and follow the on-screen instructions.

You may find this helpful to explore the features and functions of QBO by referring to the help articles available at this link.

Please don't hesitate to contact me if you have any other concerns. I'm always here to help. Have a great day ahead.