docs: protected void configurePayPalClient(final Collection<BaseClient> properties) {
          val paypal = pac4jProperties.getPaypal();
          if (StringUtils.isNotBlank(paypal.getId()) && StringUtils.isNotBlank(paypal.getSecret())) {
              val client = new PayPalClient(paypal.getId(), paypal.getSecret());
              configureClient(client, paypal);
  
              LOGGER.debug("Created client [{}] with identifier [{}]", client.getName(), client.getKey());
              properties.add(client);
          }
      }