# DiscoverDynamicCardVerificationCode
<a name="API_DiscoverDynamicCardVerificationCode"></a>

Parameters that are required to generate or verify dCVC (Dynamic Card Verification Code).

## Contents
<a name="API_DiscoverDynamicCardVerificationCode_Contents"></a>

 ** ApplicationTransactionCounter **   <a name="paymentcryptographydata-Type-DiscoverDynamicCardVerificationCode-ApplicationTransactionCounter"></a>
The transaction counter value that comes from the terminal.  
Type: String  
Length Constraints: Minimum length of 2. Maximum length of 4.  
Pattern: `[0-9a-fA-F]+`   
Required: Yes

 ** CardExpiryDate **   <a name="paymentcryptographydata-Type-DiscoverDynamicCardVerificationCode-CardExpiryDate"></a>
The expiry date of a payment card.  
Type: String  
Length Constraints: Fixed length of 4.  
Pattern: `[0-9]+`   
Required: Yes

 ** UnpredictableNumber **   <a name="paymentcryptographydata-Type-DiscoverDynamicCardVerificationCode-UnpredictableNumber"></a>
A random number that is generated by the issuer.  
Type: String  
Length Constraints: Minimum length of 2. Maximum length of 8.  
Pattern: `[0-9a-fA-F]+`   
Required: Yes

## See Also
<a name="API_DiscoverDynamicCardVerificationCode_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/payment-cryptography-data-2022-02-03/DiscoverDynamicCardVerificationCode) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/payment-cryptography-data-2022-02-03/DiscoverDynamicCardVerificationCode) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/payment-cryptography-data-2022-02-03/DiscoverDynamicCardVerificationCode)