A counterparty record is a brand's track record as someone to deal with, whether it books, delivers creative on time, and how past deals went, kept separate from identity (verification) and ability to pay (pre-authorization).
A brand's track record as someone to deal with: whether it opens opportunities and actually books, whether it delivers creative on time, how its past deals went. It answers "are they good to work with," which is deliberately separate from brand verification (identity) and pre-authorization (can they pay).