How would i add a Books Estimate to a email send within CRM

Im currently calling a function in CRM that creates a estimate.

I want to retrieve that estimate and send it via email additionally to my email template. How would I do that?
Best case would be to implement the estimate as HTML in front or after the email template, PDF would also work.

I tried:

parameters = {"accept":"pdf","print":true};

response = invokeurl

[

url :"https://www.zohoapis.eu/books/v3/estimates/1234?organization_id=1234"

type :GET

parameters:parameters.toString()

connection:"crm2books"

content-type:"application/json"

];

But i cant seem to find how to use the response i get. Can i save the estimate as a PDF in a field in CRM and then reference this field in the template or something similar?

Thanks in advance!