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payerAuthEnrollService_alternateAuthenticationMethod {#payer-auth-enroll-service-alternate-authentication-method}
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Mechanism used by the cardholder to authenticate to the 3-D Secure requestor.  
Possible values:

* `01`: No authentication occurred.
* `02`: Logged in using merchant system credentials.
* `03`: Logged in using federated ID.
* `04`: Logged in using issuer credentials.
* `05`: Logged in using third-party authenticator.
* `06`: Logged in using Fast Identity Online (FIDO) Authenticator.
* `80`: Merchant is initiating a FIDO authentication to register a Visa Payment Passkey (VPP).

Specifications {#payer-auth-enroll-service-alternate-authentication-method_d1621e63}
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* **Data Type:** Integer
* **Data Length:** 2

Mapping Information {#payer-auth-enroll-service-alternate-authentication-method_d1621e82}
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* **REST API Field:** consumerAuthenticationInformation. alternateAuthenticationMethod
* **SCMP API Field:** pa_alternate_authentication_method
* **Simple Order API Fields:**
  * payerAuthEnrollReply_alternateAuthenticationMethod
  * payerAuthEnrollService_alternateAuthenticationMethod
    {#payer-auth-enroll-service-alternate-authentication-method_d1621e106}