Hi Naresh,
Thank you for writing to us. You need to make separate call against each account under the MCC account to obtain a report with performance data for an entire campaign, or focus more narrowly. You could use segmentation to retrieve the detailed statistics. Please refer to this guide for more information on the reporting basics and segmentation using Adwords API. Let us know if you need any additional information.
Regards,
Nikisha Patel, Google Ads API Team