Which messages does Klasku send automatically?

The ones about money and schedules: an invoice issued, a due-date reminder, confirmation that a payment arrived, a canceled session, the outcome of an excused-absence request, a booked make-up class, an offer of a free seat, a published report card, and the link to an online class on the morning of the session.

Plus access messages: the Parents Portal and Teachers Portal PIN when it is created or reset, and a notice when a PIN changes. All of them are event-driven — Klasku sends no periodic messages nobody asked for.