Interface Table Name for REQ to RFQ for use in Custom Hook in Autocreate

This is with reference to the Note Custom Hook in Autocreate (Doc ID 1913325.1) that details the business events to use for invoking custom pl/sql hook code when creating RFQ.

I am specifically referring to the following:

During RFQ creation from a Requisition the description says the interface_header_id is passed as parameter to the event. I am looking for the interface table that is used here. Could someone from the Sourcing/Purchasing team help identify the specific interface table used here? I am planning on using the custom hook to transfer some of the flexfield attributes from the Requisition to the RFQ and therefore will require the specific interface table that has the interface Id that will give me access to the data elements relating to the RFQ.