template_id returned by GET /car-rental/reservations/{reservation_id}/email-templates. The send is queued: a successful response means it was accepted, not delivered._customer templates go to the customer's email (or mobile number for SMS templates). _internal templates go to the staff users linked to the reservation, such as the user who created it. Nothing is sent when there is no recipient or when the template has no subject and no text.reservation_id does not return 404: the response is still a success, but nothing is sent.success. When it is false, the body is an ErrorUnauthorized (status_code 401 or 403).{
"success": true,
"status_code": 200,
"errors": [],
"data": []
}