EMV 3-D Secure (3DS) - Payment Authentication Protocol 3.1.S15-17: 3.1.S15-17 App: cardholder response, verification, retries and abandonment (Steps 15 to 17)

After the cardholder responds, the SDK re-establishes the secure link, formats and protects a CReq with the response and sends it, setting the challenge cancellation indicator if the cardholder abandons; the ACS validates the CReq and checks the authentication data: if correct it sets status Y, the ECI, the Authentication Value and completion indicator Y and proceeds to results; if incorrect it increments the interaction counter and, at the ACS maximum, sets status N with reason 19 and completion Y, otherwise repeats the challenge.