As we cannot directly upload our extension to the Zoho desk. Firstly, we have to make a node app and upload the zip file. So, I load my third-party application in an iframe within the widget.html file. 

Now I want the contacts from the Zoho Desk portal through Zoho API('https://desk.zoho.com/api/v1/contacts') 

within my third-party application which is currently loaded in an iframe. So, the issue I am facing is that  I get the instance of the Zoho desk within my third-party app but cannot get the response of the contact API and get the parentWindow reference error.