Returns a campaign sequence by sequence_uuid, scoped to the authenticated account. The response contains the sequence metadata and its events array, ordered by event_order (deleted events excluded). Scheduling lives only on delay_timer events, which carry delay ({days, hours, minutes}), run_on_days (allowed weekdays mon..sun; an empty array means any day), and run_at_time (HH:MM, or null to fire as soon as the wait elapses). Note: delay.days counts to calendar-midnight boundaries in the account timezone, so 1 day means 'until the next midnight', not a fixed 24 hours. Every non-delay event type runs immediately after the preceding event. Email events (send_email, send_notification) include an email object whose body is html_content / raw_html_content / use_raw_html_content (same semantics as the broadcast endpoints).