code: public static LoginLink createOnAccount(
        String account, Map<String, Object> params, RequestOptions options) throws StripeException {
      String url =
          String.format(
              "%s%s",
              Stripe.getApiBase(),
              String.format("/v1/accounts/%s/login_links", ApiResource.urlEncodeId(account)));
      return request(ApiResource.RequestMethod.POST, url, params, LoginLink.class, options);
    }
docs: Creates a single-use login link for an Express account to access their Stripe dashboard.
  
  <p><strong>You may only create login links for <a href="/docs/connect/express-accounts">Express
  accounts</a> connected to your platform</strong>.