public java.util.Date getUsageStartTimestamp() {
        return this.usageStartTimestamp;
    }
<p>
The date and time after which Amazon Web Services Payment Cryptography will start using the key material for
cryptographic operations.
</p>

@return The date and time after which Amazon Web Services Payment Cryptography will start using the key material
        for cryptographic operations.
aws-java-sdk-paymentcryptography/src/main/java/com/amazonaws/services/paymentcryptography/model/Key.java