code: @Override
      public GetCertificateAuthorityCertificateResult getCertificateAuthorityCertificate(GetCertificateAuthorityCertificateRequest request) {
          request = beforeClientExecution(request);
          return executeGetCertificateAuthorityCertificate(request);
      }
docs: <p>
  Retrieves the certificate and certificate chain for your private certificate authority (CA). Both the certificate
  and the chain are base64 PEM-encoded. The chain does not include the CA certificate. Each certificate in the
  chain signs the one before it.
  </p>
  
  @param getCertificateAuthorityCertificateRequest
  @return Result of the GetCertificateAuthorityCertificate operation returned by the service.
  @throws ResourceNotFoundException
  A resource such as a private CA, S3 bucket, certificate, or audit report cannot be found.
  @throws InvalidStateException
  The private CA is in a state during which a report or certificate cannot be generated.
  @throws InvalidArnException
  The requested Amazon Resource Name (ARN) does not refer to an existing resource.
  @sample AWSACMPCA.GetCertificateAuthorityCertificate
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/acm-pca-2017-08-22/GetCertificateAuthorityCertificate"
  target="_top">AWS API Documentation</a>