Zoho creator authorzation

Zoho creator authorzation

Hello, 

I had created app with zoho creator, and trying to fetch zoho books record from it, but it gives me, 
response = zoho.books.getRecords("Items","****");
info response;

{"code":14,"message":"Invalid value passed for authtoken."}
Am not getting any idea how to add authtoken and from where. 

Thanks in advance,