docs: public ServiceCall<VoiceModel> createVoiceModel(CreateVoiceModelOptions createVoiceModelOptions) {
      Validator.notNull(createVoiceModelOptions, "createVoiceModelOptions cannot be null");
      String[] pathSegments = { "v1/customizations" };
      RequestBuilder builder = RequestBuilder.post(RequestBuilder.constructHttpUrl(getEndPoint(), pathSegments));
      Map<String, String> sdkHeaders = SdkCommon.getSdkHeaders("text_to_speech", "v1", "createVoiceModel");
      for (Entry<String, String> header : sdkHeaders.entrySet()) {
        builder.header(header.getKey(), header.getValue());
      }
      builder.header("Accept", "application/json");
      final JsonObject contentJson = new JsonObject();
      contentJson.addProperty("name", createVoiceModelOptions.name());
      if (createVoiceModelOptions.language() != null) {
        contentJson.addProperty("language", createVoiceModelOptions.language());
      }
      if (createVoiceModelOptions.description() != null) {
        contentJson.addProperty("description", createVoiceModelOptions.description());
      }
      builder.bodyJson(contentJson);
      return createServiceCall(builder.build(), ResponseConverterUtils.getObject(VoiceModel.class));
    }