public String getKmsKeyId() {
        return this.kmsKeyId;
    }
<p>
An alias, alias ARN, key ID, or key ARN of a symmetric encryption KMS key to encrypt data. To specify a KMS key
in a different Amazon Web Services account, you must use the key ARN or alias ARN.
</p>

@return An alias, alias ARN, key ID, or key ARN of a symmetric encryption KMS key to encrypt data. To specify a
        KMS key in a different Amazon Web Services account, you must use the key ARN or alias ARN.
aws-java-sdk-stepfunctions/src/main/java/com/amazonaws/services/stepfunctions/model/EncryptionConfiguration.java