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Receiving the Step-Up Results {#concept_nng_lvm_xpb}
====================================================

After the customer interacts with the issuing bank, the customer is returned to the consumerAuthenticationInformation.returnUrl within the iframe as specified in [Step 3: Payer Authentication Check Enrollment Service](/docs/vas/en-us/payer-authentication/developer/all/rest/payer-auth/pa2-ccdc-enroll-intro.md ""). Since you host the return URL, you can then close the iframe after redirection.  
The response sent back to the return URL contains these values:

* Transaction ID: (consumerAuthenticationInformation.authenticationTransactionId response field). This value is used in [Step 5: Payer Authentication Validation Service](/docs/vas/en-us/payer-authentication/developer/all/rest/payer-auth/pa2-ccdc-validate-intro.md "").
* MD: merchant data returned if present in the POST to step-up URL; otherwise, null.

{#concept_nng_lvm_xpb_ul_k3v_mvm_xpb} **POST to Return URL**

```
TransactionId=BwNsDeDPsQV4q8uy1Kq1&MD=null                            
```

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