This lists the current members of Acquiris, their roles and membership type. Possible roles are Sender of C-TAP transactions (terminal vendor (TV)), Receiver of C-TAP transactions (Acquirer Host/Processor (AH), and other Stakeholders (OS). Their type of activity defines their membership type, Principal Members have implemented the C-TAP specifications (either on terminals or on acquiring hosts), Associate Members have not implemented C- TAP, but are stakeholders in the payment industry, and Observers (have no voting rights in Acquiris).