code: public ServiceFuture<Void> purgeDeletedCertificateAsync(String vaultBaseUrl, String certificateName, final ServiceCallback<Void> serviceCallback) {
          return ServiceFuture.fromResponse(purgeDeletedCertificateWithServiceResponseAsync(vaultBaseUrl, certificateName), serviceCallback);
      }
docs: Permanently deletes the specified deleted certificate.
  The PurgeDeletedCertificate operation performs an irreversible deletion of the specified certificate, without possibility for recovery. The operation is not available if the recovery level does not specify 'Purgeable'. This operation requires the certificate/purge permission.
  
  @param vaultBaseUrl The vault name, for example https://myvault.vault.azure.net.
  @param certificateName The name of the certificate
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object