Primary key doesn't work on the Upsert Operation For Scribe Insight Salesforce Integrations
As per article Using The Upsert Operation For Scribe Insight Salesforce Integrations, see link below.
"The Upsert call uses either the entity "PRIMARY KEY" or a custom field, set as type External ID, to determine whether to create a new record or update an existing record. I assume that the primary key mentioned here is the ID of an Object (a GUID)."
I tried using a primary key but it doesn't able to identify that the record already exist, instead its create a new record.
Question: Please advise what is this primary key really is or how to use it to Upsert Operation in Scribe Insight Salesforce Integration?