code: public Observable<IntegrationAccountCertificateInner> getAsync(String resourceGroupName, String integrationAccountName, String certificateName) {
          return getWithServiceResponseAsync(resourceGroupName, integrationAccountName, certificateName).map(new Func1<ServiceResponse<IntegrationAccountCertificateInner>, IntegrationAccountCertificateInner>() {
              @Override
              public IntegrationAccountCertificateInner call(ServiceResponse<IntegrationAccountCertificateInner> response) {
                  return response.body();
              }
          });
      }
docs: Gets an integration account certificate.
  
  @param resourceGroupName The resource group name.
  @param integrationAccountName The integration account name.
  @param certificateName The integration account certificate name.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the IntegrationAccountCertificateInner object