Netsuite collection. creating signature

I am working with the Netsuite REST API Tutorial collection (downloaded from netsuite).

I have everything functioning within postman fine. Able to make all the CRUD calls without issue.
I am now trying to replicate this in my own system but have been unable to duplicate the signature creation that is being used in postman. Unfortunately the documentation from netsuite lacks the information on this as well. I can see it is pulling a unix timestamp and creating a nonce but i do not know the string order and format for creating the signature.

  1. is there a way to export a detailed log showing how it is calculated? I tried to pull the console log but it only shows the values and not how the signature is created
  2. If not, does ANYONE know how to handle this?

Its frustrating to have it working within postman but not have the visibility to replicate it elsewhere.

Thanks