Whole-trip brief for 1-5 destinations: per destination, in order, entry (as check_entry_requirements, if passport given), power verdict from home_country, currency, emergency numbers, driving side, tipping and holidays between from and to. Use it to summarise a trip; for one fact use check_entry_requirements, check_power_compatibility, get_emergency_numbers, get_tipping_norms or get_public_holidays, and get_country_facts for one country without dates. No passport: entry null, no advisory. If one destination's entry can't be answered (outside pilot, no data, same country) it is {unavailable: reason} and the rest still returns. power is null at home or without plug data; a category without data is {}. An unknown home or destination code, over 5 destinations or a bad date range fails the call. Each fact is cited: sources[] (url, license), last_verified, confidence. Show the advisory.
Parameters: passport = nationality (optional); home_country = where traveller and devices come from; destinations in travel order, home only if it is a stop; from/to = whole trip, inclusive. Example: {"passport":"US","home_country":"US","destinations":["JP","KR"],"from":"2026-12-28","to":"2027-01-05"}.
Read-only; free API key or x402, charged per call, not per destination (https://citedtravel.com/pricing/); errors RFC 9457.