FlexpaLink.create({
  publishableKey: import.meta.env.VITE_FLEXPA_PUBLISHABLE_KEY,
  onSuccess: async (publicToken: string) => {
    /*  Make a request to the `POST /flexpa-access-token` endpoint 
        defined in `server`.
        Include the `publicToken` in the body. */
    const resp = await fetch(
      `${import.meta.env.VITE_SERVER_URL}/flexpa-access-token`,
      {
        method: "POST",
        headers: { "content-type": "application/json" },
        body: JSON.stringify({ publicToken }),
      }
    );
  },
});