User story

As a hotel system, I want to send a transactional message (e.g. a digital room key) through Conversations via API, so that guests without an email address still get their key.

Problem / context

Guests booked via OTAs often have no real email. We match the phone number in the CRM, but cannot send a WhatsApp template with reservation-specific variables (room, PIN, dates). Support suggested a contact-created trigger, which does not fit because the data belongs to the reservation, not the contact.

Acceptance criteria