Attendee details + the link's declared custom questions (`SUPPORTED_FORM_FIELD_TYPES`) + VERBATIM legal-consent copy. react-hook-form + `zodResolver(makeBookingSchema(...))` (ContactForm scaffolding). Bot protection is load-bearing: `` + humanity signals merged into the POST body. See [`docs/EMBEDDING_HUBSPOT_MEETINGS.md`](../../../docs/EMBEDDING_HUBSPOT_MEETINGS.md).