Hello community, 

Just wanted to share..

While requested to access some service I was told to authenticate my request using OAuth 1.0 (revision A) with  HMAC-SHA256 as a signing method. And knowing little to none about it. I started by testing it first in Postman, and all worked just fine. BUT with Object Script, well.. a big smile goes here! :) as I had some issues and no one to suggest..  
In the end the most helpful thing to do was to refer the docs here :  https://oauth.net/core/1.0a/  while the signature method in it is for HMAC-SHA1 and RSA-SHA1 it is valid for HMAC-SHA256 as