code: @Override
      public GetClientCertificatesResult getClientCertificates(GetClientCertificatesRequest request) {
          request = beforeClientExecution(request);
          return executeGetClientCertificates(request);
      }
docs: <p>
  Gets a collection of <a>ClientCertificate</a> resources.
  </p>
  
  @param getClientCertificatesRequest
  A request to get information about a collection of <a>ClientCertificate</a> resources.
  @return Result of the GetClientCertificates operation returned by the service.
  @throws BadRequestException
  The submitted request is not valid, for example, the input is incomplete or incorrect. See the
  accompanying error message for details.
  @throws UnauthorizedException
  The request is denied because the caller has insufficient permissions.
  @throws TooManyRequestsException
  The request has reached its throttling limit. Retry after the specified time period.
  @sample AmazonApiGateway.GetClientCertificates