2. Actors and definitions

1.1 Actors and definitions

Following the actors expected and the related acronyms used in the document:

• PSU - Payment Services User
  He is the subject using all the payment services defined and provided by the PSD2 ecosystem.
• PISP-Payment Initiation Service Provider
  This entity provides the PSU with the service to set up payment transactions; the related services supplied can be identified as PIS (Payment Initiation Service).
  
• PIISP-Payment Instrument Issuing Service Provider (also known as CISP – Card Issuing Service Provider).
  This entity provides information about the funds availability on PSD2 payment transactions based on the payment cards. The related services supplied can be identified as FCS (Confirmation on the Availability of Funds Service).
  
• AISP_Account Information Service Provider
  This entity offers information services about the payment accounts. The related services can be identified as AIS (Account Information Service).
  
• ASPSP-Account Servicing Payment Service Provider
  This is the entity where the payment accounts resides. It receives payment requests, receive payments, provides information on managed payment accounts.
  
• TPP-Third Party Provider
  A general definition of the provided services inside the PSD2 on behalf of a PSU. A TPP may have one or more of the PISP, AISP, PIISP roles and it is able to communicate with the involved ASPSPs through the interfaces defined by the PSD2 Gateway.