# Verify card data
<a name="verify-card-data"></a>

`Verify Card Data` is used to verify data that has been created using payment algorithms that rely on encryption principals such as `DISCOVER_DYNAMIC_CARD_VERIFICATION_CODE`. 

The input values are typically provided as part of an inbound transaction to an issuer or supporting platform partner. To verify an ARQC cryptogram (used for EMV chips cards), please see [Verify ARQC](data-operations.verifyauthrequestcryptogram.md). 

For more information, see [VerifyCardValidationData](https://docs.aws.amazon.com/payment-cryptography/latest/DataAPIReference/API_VerifyCardValidationData.html) in the API guide.

If the value is verified, then the api will return http/200. If the value is not verified, it will return http/400.

# Verify CVV2
<a name="verify-cvv2"></a>

**Example**  
In this example, we will validate a CVV/CVV2 for a given PAN. The CVV2 is typically provided by the cardholder or user during transaction time for validation. In order to validate their input, the following values will be provided at runtime - [Key to Use for validation (CVK)](create-keys.md#cvvkey-example), `PAN`, card expiration date and CVV2 entered. Card expiration format must match that used in initial value generation.   
For all available parameters see [CardVerificationValue2](https://docs.aws.amazon.com/payment-cryptography/latest/DataAPIReference/API_CardVerificationValue2.html) in the API reference guide.   

```
$ aws payment-cryptography-data verify-card-validation-data --key-identifier arn:aws:payment-cryptography:us-east-2:111122223333:key/tqv5yij6wtxx64pi --primary-account-number=171234567890123 --verification-attributes CardVerificationValue2={CardExpiryDate=0123} --validation-data 801
```

```
  {
      "KeyArn": "arn:aws:payment-cryptography:us-east-2:111122223333:key/tqv5yij6wtxx64pi",
      "KeyCheckValue": "CADDA1"
  }
```

# Verify iCVV
<a name="verify-iCVV"></a>

**Example**  
In this example, we will verify a [iCVV](terminology.md#terms.icvv) for a given PAN with inputs of [Key to Use for validation (CVK)](create-keys.md#cvvkey-example), `PAN`, a service code of 999, card expiration date and the iCVV provided by the transaction to validate.   
iCVV is not a user entered value (like CVV2) but embedded on an EMV card. Consideration should be given to whether it should always validate when provided.  
For all available parameters see, [CardVerificationValue1](https://docs.aws.amazon.com/payment-cryptography/latest/DataAPIReference/API_CardVerificationValue1.html) in the API reference guide.   

```
$ aws payment-cryptography-data verify-card-validation-data --key-identifier arn:aws:payment-cryptography:us-east-2:111122223333:key/tqv5yij6wtxx64pi --primary-account-number=171234567890123 --verification-attributes CardVerificationValue1='{CardExpiryDate=1127,ServiceCode=999} --validation-data 801
```

```
{
    "KeyArn": "arn:aws:payment-cryptography:us-east-2:111122223333:key/tqv5yij6wtxx64pi",
    "KeyCheckValue": "CADDA1",
    "ValidationData": "801"
}
```