[Answered ]-How do i get the control back to my app from the popup which comes up in quickbooks oauth

But what it does is, it opens a new pop up like window and goes through the oauth process,

This is expected behavior. This should happen. The entire OAuth process takes place within the pop-up.

Now the redirect url is also opened within the pop up window.

It should be, this is good.

All you have to do is use window.close() to close the pop-up once the OAuth process completes.