REST API

Receiving the Step-Up Results

After the customer interacts with the issuing bank, the user is redirected back to the
consumerAuthenticationInformation.returnUrl
within the iframe as specified in Step 3: Payer Authentication Check Enrollment Service. The payload sent to the returnURL is URL-encoded and Base64-encoded (see the example below). The merchant hosting the returnURL can then close the iframe after redirection.
The response sent back to the return URL contains the following:
  • Transaction ID: (
    consumerAuthenticationInformation.authenticationTransactionId
    response field). This 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