Poll a connection request; status approved carries the bearer token once

Send the poll_token as Authorization: Bearer <poll_token> (or ?poll_token=). Statuses: pending, approved (with token), consumed, denied, expired. The approved answer also carries subscription (active or not; recording needs it, reading does not; trial_available says whether the free trial still applies: it is given once per person, cancelling during the trial ends recording at once and a returning subscriber pays from the first day) and tell_the_user: the first message to show the person in their language, verbatim.