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Receiving an AS110 response code in the response of the get3dsecver2 web service means that an additional card holder verification is required (Challenge Flow). In the threedsdata data block, the challenge parameter will be equal to C, and the challengeurl and challengerequest parameters will be filled (block 108).In  In this case, the enterprise should generate an HTML iFrame object on the payment page and send an HTTP POST request for the card holder verification to the specified URL (block 11) with the creq parameter, in which pass the received challengerequest value. This iFrame displays the ACS page of the issuing bank and the customer enters a one-time password received from the bank.

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