In case the Access Control Server (ACS) of the cardholder's bank does not support any EMV 3DS protocol version (i.e. 2.0 or higher, see acsStartProtocolVersion) the threeDSMethodDataForm element of the versioningData object in the payment response will be Null.
Sequence Diagram
3DS 1.0 Authentication
In order to a 3DS 1.0 authentication request through the cardholder browser it is required to construct a form with the data elements provided in threeDSLegacy and to post it to the acsURL.
The form fields that are sent to the ACS are listed in the table below:
Sample: PAReq form passed through the Cardholder to the ACS URL
<html>
<head>
<script language=\"javascript\">
<!--
function sendpareq()
{
document.pareq_form.submit();
}
// -->
</script>
</head>
<body onload="javascript:sendpareq();">
<form action="https://pit.3dsecure.net/VbVTestSuiteService/pit1/acsService/paReq?summary=ZTIwOWMwYmEtNTVhOC00NDExLThkZDktYzllODk1NmZlNDQ0" method="POST" name="pareq_form">
<input type="hidden" name="PaReq" value="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">
<input type="hidden" name="TermUrl" value="http://localhost:40405/test/3DTermURL.aspx?PayID=dc67820e15f049c9b6c1f0420729da8a&TransID=20180524-162741-084&MID=gustav">
<input type="hidden" name="MD" value="Optional merchant session data">
</form>
</body>
</html>
Once the authentication has been completed or the cancelled by the cardholder the ACS will redirect the cardholder through the cardholder's browser to the TermURL as specified in the initail payment request.
The Payer Authentication Response (PaRes) will be transferred via HTTP POST method while MID, PayID and TransID are sent in the HTTP query string (i.e. HTTP GET).
Data Elements transferred to the TermURL
Authorization
In order to authorize an 3DS 1.0 authenticated payment you must POST the parameter as listed in the table below unencrypted to https://www.computop-paygate.com/direct3d.aspx. The response always is encrypted (Len + Data).