public String getValidationCertificateArn() {
        return this.validationCertificateArn;
    }
<p>
The certificate used to validate the server certificate and prove domain name ownership. This certificate must be
signed by a public certificate authority. This value is not required for Amazon Web Services-managed domains.
</p>

@return The certificate used to validate the server certificate and prove domain name ownership. This certificate
        must be signed by a public certificate authority. This value is not required for Amazon Web
        Services-managed domains.
aws-java-sdk-iot/src/main/java/com/amazonaws/services/iot/model/CreateDomainConfigurationRequest.java