zoho books API, cannot get new version of postman oauth 2.0 working

zoho books API, cannot get new version of postman oauth 2.0 working

Hi, I am a long time Zoho books user.  I have written some API code for timesheet reporting for my own company.  While I am able to make my own code work, I am unable to use the Zoho books collection in Postman.  It looks like Postman may have updated or something, but no matter how hard I try, and I am an experienced API developer, I cannot get the Oauth 2.0 function in postman to work.  

Is there a way the implementation can just get a new token as needed?  Instead I wind up using my application to generate the token, grab it and do my API testing within postman.  I would much prefer if I could use the Oauth2.0 function within postman, which for me works for other sites well with Zoho books.  Do you have an updated doc for this or an updated collection?
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