docs: public ServiceCall<Void> unregisterCallback(UnregisterCallbackOptions unregisterCallbackOptions) {
      Validator.notNull(unregisterCallbackOptions, "unregisterCallbackOptions cannot be null");
      String[] pathSegments = { "v1/unregister_callback" };
      RequestBuilder builder = RequestBuilder.post(RequestBuilder.constructHttpUrl(getEndPoint(), pathSegments));
      Map<String, String> sdkHeaders = SdkCommon.getSdkHeaders("speech_to_text", "v1", "unregisterCallback");
      for (Entry<String, String> header : sdkHeaders.entrySet()) {
        builder.header(header.getKey(), header.getValue());
      }
      builder.query("callback_url", unregisterCallbackOptions.callbackUrl());
      return createServiceCall(builder.build(), ResponseConverterUtils.getVoid());
    }