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Diagram illustrating the Access Control Server (ACS) role in the 3-D Secure authentication protocol

Security

How can I find the list of Access Security Control (ACS) companies?

Access Security Control (ACS) is the security protocol that the card-issuing bank must maintain under the 3-D Secure protocol to support cardholder authentication. 3-D Secure is an XML-based protocol that adds an extra security layer to online card payments.

Diagram showing the CAT (Cardholder Activated Terminal) Indicator field used in payment authorization messages

Merchant & POS

What is the CAT (Cardholder Activated Terminal) Indicator?

CAT (Cardholder Activated Terminal) devices are typically unattended terminals that accept various payment cards. These terminals are frequently installed at railway ticket stations, gas stations, toll roads, parking lots, and other commercial locations.

Diagram showing the structure of an EMV AID value split into RID and PIX sections

EMV

What is the Registered Application Provider Identifier (RID)?

RID is part of the AID value, which is structured according to ISO/IEC 7816-5 and consists of two sections: a value specific to the application provider, and an optional field used to identify different providers or products.