The PayPal “AUP” is the PayPal Acceptable Use Policy.
The header of it: You are independently responsible for complying with all applicable laws in all of your actions related to your use of PayPal’s services, regardless of the purpose of the use. In addition, you must adhere to the terms of this Acceptable Use Policy. Violation of this Acceptable Use Policy constitutes a violation of your PayPal User Agreement and may subject you to damages, including liquidated damages of $2500.00 U.S. dollars per violation, which may be debited directly from your PayPal account(s) as outlined in the User Agreement (see “Restricted Activities, Holds & Liquidated Damages” section of the PayPal User Agreement).
Read all AUP rules of PayPal here