You will find it in the old FCRA Commentary. There is no reason to believe that this section of the FCRA would be interpreted any different today:
"(3) How third party creditors can insure that the exemption applies.
Creditors, who are requested by dealers or merchants to make such specific extensions of credit, can assure that communication of their decision to the dealer or merchant will be exempt under this section from the term "consumer report,'' by having written agreements that require such parties to inform the consumer of the creditor's name and address and by complying with any applicable provisions of section 615."
Check it out here: LAWDOG