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

@param keyIdentifier
       The <code>KeyArn</code> of the key.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-paymentcryptography/src/main/java/com/amazonaws/services/paymentcryptography/model/StartKeyUsageRequest.java