docs: public ServiceFuture<List<AppServiceCertificateResourceInner>> listCertificatesAsync(final String resourceGroupName, final String certificateOrderName, final ListOperationCallback<AppServiceCertificateResourceInner> serviceCallback) {
          return AzureServiceFuture.fromPageResponse(
              listCertificatesSinglePageAsync(resourceGroupName, certificateOrderName),
              new Func1<String, Observable<ServiceResponse<Page<AppServiceCertificateResourceInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<AppServiceCertificateResourceInner>>> call(String nextPageLink) {
                      return listCertificatesNextSinglePageAsync(nextPageLink);
                  }
              },
              serviceCallback);
      }