Interview was scheduled with third party client (HDFC Bank). Single round with client and HR round with ITC infotech. Questions asked were scenario based: 1. How API call works? 2.If any issue identified ?What are the steps to troubleshoot them? 3.Certificate: Who are signatory authorities, how to import certificate, is root mandatory important for each certificate? 4. If API response code is 400 what steps or actions you will take? 5. If APi response id 200 success but user reports error how to debug the issue.