docs: public Observable<ServiceResponse<AppServiceCertificateResourceInner>> createOrUpdateCertificateWithServiceResponseAsync(String resourceGroupName, String certificateOrderName, String name, AppServiceCertificateResourceInner keyVaultCertificate) {
          if (resourceGroupName == null) {
              throw new IllegalArgumentException("Parameter resourceGroupName is required and cannot be null.");
          }
          if (certificateOrderName == null) {
              throw new IllegalArgumentException("Parameter certificateOrderName is required and cannot be null.");
          }
          if (name == null) {
              throw new IllegalArgumentException("Parameter name is required and cannot be null.");
          }
          if (this.client.subscriptionId() == null) {
              throw new IllegalArgumentException("Parameter this.client.subscriptionId() is required and cannot be null.");
          }
          if (keyVaultCertificate == null) {
              throw new IllegalArgumentException("Parameter keyVaultCertificate is required and cannot be null.");
          }
          if (this.client.apiVersion() == null) {
              throw new IllegalArgumentException("Parameter this.client.apiVersion() is required and cannot be null.");
          }
          Validator.validate(keyVaultCertificate);
          Observable<Response<ResponseBody>> observable = service.createOrUpdateCertificate(resourceGroupName, certificateOrderName, name, this.client.subscriptionId(), keyVaultCertificate, this.client.apiVersion(), this.client.acceptLanguage(), this.client.userAgent());
          return client.getAzureClient().getPutOrPatchResultAsync(observable, new TypeToken<AppServiceCertificateResourceInner>() { }.getType());
      }