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PIN entry on Tap to Phone solutions, because of its very sensitive nature, is handled by the Secure Client (and the Secure Backend). The flow is relatively simple, the PIN prompt is triggered by one API call. The output of the PIN entry is provided through a callback.

The following figure describes the message flow between the different merchant’s system components involved in the online PIN verification process:

• For security reasons, the PAN (card data), returned by the L2/OLA API and the partial PIN block, returned by SCSDK PIN pad are encrypted using two different key set in two independent key spaces, named security domains (identified as PIN and PAN).

• It is the role of the merchant’s system to transmit and use the PIN and PAN cryptograms for computing the standard PIN block in a secure environment. The resulting PIN block is used in the actual online PIN verification.

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PIN prompt

To launch the PIN entry screen, once must call the pinEnter() method from the AOneAppSecurity class as follows:

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