How do I get my account id?

How do I get my account id?

Hello, I followed the instructions to get a list of accounts of the currently authenticated user (which is me, and I am logged in).

But when I follow the below instructions I get the following error:

ERROR:
{"data":{"errorCode":"INVALID_TICKET","moreInfo":"Invalid ticket"},"status":{"code":400,"description":"Invalid Input"}}

Instructions that I am following:
GET - User account details
Purpose

The API retrieves the list of accounts of the currently authenticated user.
 Request URL

 http://mail.zoho.com/api/accounts

Is there something that I am missing here?