Acceptor
Access point
Access right
Accounting Centre
Accounting transaction
Acknowledgement
Algorithm
Approval
Archiving
Assessment
Evaluation
Asymmetric algorithm
ATM card
ATM withdrawal
Attack
Audit trail
Authentication
Authorisation
Authorisation request
Automated clearing house (ACH)
Automated teller machine (ATM)
Availability

Acknowledgement

Message informing the issuer of the acknowledgement, suspension or rejection of its operations, and of the detection of any abnormalities.