Hi @nikhil.nanda, are you looking for participant reports? That would be returned here: /v2/report/webinars/{webinarId}/participants - reference
If you are looking for Webinar details, /v2/report/webinars/{webinarId} should return details on any valid Webinar UUID.
If you use the 11-digit Webinar ID, the endpoint will return the last instance of the event. You can also specify the webinar UUID for the exact instance of a recurring Webinar.