code: public void deleteSubscription(String subscriptionId) throws IOException {
          checkArgument(!subscriptionId.isEmpty(), "Subscription ID cannot be empty.");
  
          final URI uri = baseUri.resolve(String.format("/subscriptions/%s", subscriptionId));
          final Request request = clientHttpRequestFactory.createRequest(uri, "DELETE");
  
          request.getHeaders().setContentType(ContentType.APPLICATION_JSON);
  
          try (final Response response = request.execute()) {
  
              final int status = response.getStatusCode();
              if (status == 204) {
                  LOG.debug("Successfully deleted subscription [{}]", subscriptionId);
              }
          }
  
      }
docs: Delete subscription based on subscription ID.