I followed the documentation which require me to generate an auth token with

https://accounts.zoho.com/apiauthtoken/create?SCOPE= ZohoBooks.salesorders.READ

But I get invalid scope details

I tried  https://accounts.zoho.com/apiauthtoken/create?SCOPE=ZohoBooks/booksapi

and I got a token but in my API request, I get the response 

{code: 57, message: "You are not authorized to perform this operation"}

I would appreciate if anyone could help as I have been stuck for weeks and its getting on my nerves now because I followed as the documentation suggested