What is a PSU? Follow Naomi Last updated June 08, 2018 10:24 A PSU stands for Payment Services User ; simply, it is another word for consumer or end user. Related articles What is a PSP? What is AIS? What is PIS? Do I need to be regulated to provide Account Information Services? (AIS) What is the difference between PSD2 and Open Banking? Comments 0 comments Article is closed for comments.