code: public PagedList<DeletedCertificateItem> getDeletedCertificates(final String vaultBaseUrl) {
          ServiceResponse<Page<DeletedCertificateItem>> response = getDeletedCertificatesSinglePageAsync(vaultBaseUrl).toBlocking().single();
          return new PagedList<DeletedCertificateItem>(response.body()) {
              @Override
              public Page<DeletedCertificateItem> nextPage(String nextPageLink) {
                  return getDeletedCertificatesNextSinglePageAsync(nextPageLink).toBlocking().single().body();
              }
          };
      }
docs: Lists the deleted certificates in the specified vault currently available for recovery.
  The GetDeletedCertificates operation retrieves the certificates in the current vault which are in a deleted state and ready for recovery or purging. This operation includes deletion-specific information. This operation requires the certificates/get/list permission. This operation can only be enabled on soft-delete enabled vaults.
  
  @param vaultBaseUrl The vault name, for example https://myvault.vault.azure.net.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws KeyVaultErrorException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the PagedList&lt;DeletedCertificateItem&gt; object if successful.