code: public Observable<ServiceResponseWithHeaders<Page<Certificate>, CertificateListHeaders>> listNextWithServiceResponseAsync(final String nextPageLink, final CertificateListNextOptions certificateListNextOptions) {
          return listNextSinglePageAsync(nextPageLink, certificateListNextOptions)
              .concatMap(new Func1<ServiceResponseWithHeaders<Page<Certificate>, CertificateListHeaders>, Observable<ServiceResponseWithHeaders<Page<Certificate>, CertificateListHeaders>>>() {
                  @Override
                  public Observable<ServiceResponseWithHeaders<Page<Certificate>, CertificateListHeaders>> call(ServiceResponseWithHeaders<Page<Certificate>, CertificateListHeaders> page) {
                      String nextPageLink = page.body().nextPageLink();
                      if (nextPageLink == null) {
                          return Observable.just(page);
                      }
                      return Observable.just(page).concatWith(listNextWithServiceResponseAsync(nextPageLink, certificateListNextOptions));
                  }
              });
      }
docs: Lists all of the certificates that have been added to the specified account.
  
  @param nextPageLink The NextLink from the previous successful call to List operation.
  @param certificateListNextOptions Additional parameters for the operation
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;Certificate&gt; object