Required Fields for Validating Payer Authentication {#pa2-use-validate-reqd-fields-google}
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These fields are the minimum fields required when requesting the Payer Authentication Validation service. Other fields to collect additional information during a transaction are available in the list of optional fields. Under certain circumstances, some of the fields that are normally optional may be required. The circumstances that make an optional field, a required field, are noted.

authenticationTransactionID
:

clientReferenceInformation.code
:

merchantID
:

orderInformation.amountDetails.currency
:

orderInformation.amountDetails.total Amount
:
Required when the orderInformation.lineItems.unitPrice field is not used.

orderInformation.lineItems.unitPrice
:
Required when the orderInformation.amountDetails.totalAmount field is not used.

paymentInformation.card.number
:

paymentInformation.card.type
:

paymentInformation.card.expirationMonth
:
Required when paymentInformation.card.number is not included.

paymentInformation.card.expirationYear
:
Required when paymentInformation.card.number is included.