Which of the following is NOT part of the documentation required for paying referral fees?

The correct choice is the client satisfaction survey because it does not pertain to the legal requirements for documenting referral fees in real estate transactions. Typically, to comply with regulations surrounding referral fees, the necessary documentation includes a copy of a W9 for the brokerage to capture tax identification information, proof of licensure to confirm that the referring party is licensed to operate in real estate, and written documentation outlining the terms of the referral fee, which serves as an official record of the agreement between the parties involved.

A client satisfaction survey, while valuable for assessing service quality, is not relevant to the legal documentation required for referral fee transactions and does not impact the legitimacy or regulatory compliance of the fee payment. Therefore, it is the correct answer to the question about what is not part of the documentation required for paying referral fees.