Overall Architecture

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Agnos

Agnos provides a set of EMV core primitives which support EMV transaction flow.

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Agnos is split up into two sets of primitives:

• Selection set: explicit selection and pse selection.

• EMV set: Final Select, GPO, Read Record, ODA (SDA,DDA, CDA), CVM, Terminal Action Analysis, Card Action Analysis

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Agnos provides three modes of execution (see Training modules for more details):

• Direct Execution (meant for contact): an EMV transaction is peformed from Final Select to Generate AC1

• Granular Calls (meant for contactless): an EMV transaction is performed step-by-step depending on a specific logic. Each EMV step is directly called and the control is implemented outside the core engine

• State Machine (meant for contact and contactless): an EMV transaction can be formed performed step-by-step with the control inside and outside the core engine (a mix between to 2 previous modes to reduce the complexity of granular calls sequence)

AgnosMW

AgnosMW provides a set of primitives to manage the transient data model. It also defines the C structures used to manage transaction flows, mainly:

• tPaymentContext

• tOutComeParameter

AgnosEP

AgnosEP provides the main point of entry to initiate EMV transactions for CL acceptance system. It shall be called from the payment application which shall manage two structures:

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