code: public Observable<AppServiceCertificateResourceInner> getCertificateAsync(String resourceGroupName, String certificateOrderName, String name) {
          return getCertificateWithServiceResponseAsync(resourceGroupName, certificateOrderName, name).map(new Func1<ServiceResponse<AppServiceCertificateResourceInner>, AppServiceCertificateResourceInner>() {
              @Override
              public AppServiceCertificateResourceInner call(ServiceResponse<AppServiceCertificateResourceInner> response) {
                  return response.body();
              }
          });
      }
docs: Get the certificate associated with a certificate order.
  Get the certificate associated with a certificate order.
  
  @param resourceGroupName Name of the resource group to which the resource belongs.
  @param certificateOrderName Name of the certificate order.
  @param name Name of the certificate.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the AppServiceCertificateResourceInner object