# DynamicCardVerificationCode
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Parameters that are required to generate or verify Dynamic Card Verification Value (dCVV).

## Contents
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 ** ApplicationTransactionCounter **   <a name="paymentcryptographydata-Type-DynamicCardVerificationCode-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

 ** PanSequenceNumber **   <a name="paymentcryptographydata-Type-DynamicCardVerificationCode-PanSequenceNumber"></a>
A number that identifies and differentiates payment cards with the same Primary Account Number (PAN).  
Type: String  
Length Constraints: Fixed length of 2.  
Pattern: `[0-9]+`   
Required: Yes

 ** TrackData **   <a name="paymentcryptographydata-Type-DynamicCardVerificationCode-TrackData"></a>
The data on the two tracks of magnetic cards used for financial transactions. This includes the cardholder name, PAN, expiration date, bank ID (BIN) and several other numbers the issuing bank uses to validate the data received.  
Type: String  
Length Constraints: Minimum length of 2. Maximum length of 160.  
Pattern: `[0-9a-fA-F]+`   
Required: Yes

 ** UnpredictableNumber **   <a name="paymentcryptographydata-Type-DynamicCardVerificationCode-UnpredictableNumber"></a>
A random number 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
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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/DynamicCardVerificationCode) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/payment-cryptography-data-2022-02-03/DynamicCardVerificationCode) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/payment-cryptography-data-2022-02-03/DynamicCardVerificationCode)