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Optional Fields for Validating a Challenge {#id_imp_vvm_rfc}
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These fields are optional when validating a Payer Authentication transaction. In certain circumstances, the information provided by an optional field might be required before a transaction can proceed. Those optional fields that are sometimes required are listed in the required fields with the circumstance described.

[consumerAuthenticationInformation. authenticationBrand](https://developer.visaacceptance.com/docs/vas/en-us/api-fields/reference/all/rest/api-fields/cons-auth-info-aa/cons-auth-info-authentication-brand.md "")
:
This field is only used with mada cards.

[consumerAuthenticationInformation.credentialEncrypted](https://developer.visaacceptance.com/docs/vas/en-us/api-fields/reference/all/rest/api-fields/cons-auth-info-aa/cons-auth-info-credential-encrypted.md "")
:

[consumerAuthenticationInformation.responseAccessToken](https://developer.visaacceptance.com/docs/vas/en-us/api-fields/reference/all/rest/api-fields/cons-auth-info-aa/cons-auth-info-response-access-token.md "")
:

[consumerAuthenticationInformation.signedPares](https://developer.visaacceptance.com/docs/vas/en-us/api-fields/reference/all/rest/api-fields/cons-auth-info-aa/cons-auth-info-signed-pares.md "")
:  
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