Receiving the Step-Up Results

After the customer interacts with the issuing bank, the customer is returned to the
payerAuthEnrollService_returnURL
within the iframe as specified in Step 3: Payer Authentication Check Enrollment Service. The payload sent to the return URL is URL-encoded and Base64-encoded (see the example below). The merchant hosting the return URL can then close the iframe after redirection.
The response sent back to the return URL contains these values:
  • Transaction ID: (
    payerAuthEnrollReply_authenticationTransactionID
    response field). This value is used in Step 5: Payer Authentication Validation Service.
  • MD: merchant data returned if present in the POST to step-up URL; otherwise, null.
POST to Return URL
TransactionId=BwNsDeDPsQV4q8uy1Kq1&MD=null