ccAuthService_cavv {#cc-auth-service-cavv-a}
============================================

Cardholder authentication verification value (CAVV).  
This value is a transaction identifier generated by the issuing bank during payer authentication.  
This value must be 28-character Base64 or 40-character hex binary.  
When you request the payer authentication and authorization services separately, get the value for this field from the payerAuthValidateReply_cavv response field.  
**Apple Pay and Samsung Pay Transactions**

* American Express: for a 20-byte cryptogram, set this field to the cryptogram for authorizations with payment network tokens. For a 40-byte cryptogram, set this field to block A of the cryptogram for authorizations with payment network tokens.
* Discover: the value for this field can be a 20 or 40-character hex binary. All cryptograms use one of these formats.
* Visa: the value for this field must be 28-character base 64 or 40-character hex binary. All cryptograms use one of these formats.

`China UnionPay`
:
This field and ccAuthService_commerceIndicator field are required for authorizations for China UnionPay domestic debit cards.

`FDC Nashville Global`
:
For Visa Secure, this field is set to the value for the transaction identifier (XID) when the XID is present in the authorization request and the CAVV is not present.

`Visa Platform Connect`
:
The value for this field corresponds to this data in the TC 33 capture file:

    * Record: CP01 TCR8
    * Position: 77-78
    * Field: CAVV version and authentication action
    {#cc-auth-service-cavv-a_d1558e85}

Specifications {#cc-auth-service-cavv-a_d1558e100}
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* **Data Type:** String
* **Data Length (request):** 40
* **Data Length (response):** 255

Mapping Information {#cc-auth-service-cavv-a_d1558e124}
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* **REST API Field:** consumerAuthenticationInformation.cavv
* **SCMP API Fields:**
  * cavv
  * pa_enroll_cavv
  * pa_validate_cavv
* **Simple Order API Fields:**
  * ccAuthService_cavv
  * payerAuthEnrollReply_cavv
* payerAuthValidateReply_cavv