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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.

[payerAuthValidateReply_authenticationBrand](https://developer.cybersource.com/docs/cybs/en-us/api-fields/reference/all/so/api-fields/payer-auth-validate-reply-authentication-brand.md "")
:
This field is used only with mada cards.

[payerAuthValidateReply_authorizationPayload](https://developer.cybersource.com/docs/cybs/en-us/api-fields/reference/all/so/api-fields/payer-auth-validate-reply-authorization-payload.md "")
:
:

[payerAuthValidateService_credentialEncrypted](https://developer.cybersource.com/docs/cybs/en-us/api-fields/reference/all/so/api-fields/payer-auth-validate-service-credential-encrypted.md "")
:

[payerAuthValidateService_responseAccessToken](https://developer.cybersource.com/docs/cybs/en-us/api-fields/reference/all/so/api-fields/payer-auth-validate-service-response-access-token.md "")
:

[payerAuthValidateService_signedPARes](https://developer.cybersource.com/docs/cybs/en-us/api-fields/reference/all/so/api-fields/payer-auth-validate-service-signed-pares.md "")
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