public void setKeyIdentifier(String keyIdentifier) {
        this.keyIdentifier = keyIdentifier;
    }
<p>
The <code>KeyArn</code> of the key.
</p>

@param keyIdentifier
       The <code>KeyArn</code> of the key.
aws-java-sdk-paymentcryptography/src/main/java/com/amazonaws/services/paymentcryptography/model/StartKeyUsageRequest.java