Term     Description
SCA Strong Customer Authentication. Strong Customer Authentication is an authentication based on the use of two or more elements categorized as knowledge (something only the user knows), possession (something only the user possesses) and inherence (something the user is) that are independent, in that the breach of one does not compromise the reliability of the others, and is designed in such a way as to protect the confidentiality of the authentication data.
TPP Third Party Provider. A TPP needs a license from the local Financial Supervisory Authority to be able to operate as an Account Information Service Providers (AISP) and/or Payment Initiation Service Providers (PISP).
ASPSP Account Servicing Payment Service Providers provide and maintain bank accounts for their customers.
PSU Payment Service User, the end-user of the PSD2 services.
PISP Payment Initiation Service Provider, a TPP that can initiate payments on behalf of the customer.
AISP Account Information Service Provider, any (financial) provider with access to customers’ bank accounts aggregating all data to analyze the spending behavior so to provide a complete overview  of their financial situation.
AIS Account Information Service, an online service which provides consolidated information on payment accounts held by a payment service user with payment service providers.
PIS Payment Initiation Service, an online service which accesses a user’s payment account to initiate the transfer of funds on their behalf with the user’s consent and authentication.