Stays only in this browser's local storage — sent to the provider you pick above on every message, never saved on the server.
Encrypted at rest on id.ictroo.com, so you don't have to re-enter it on every device. Once saved, pick it from the "Model" dropdown up in the header — manage (edit/remove) saved connectors any time on your account page.
Servers that need auth need your own token below their checkbox — never stored server-side, sent only when you use them.