If a student shows up late to your session, it is up to you whether to conduct a 30 minute session or to do the session only with the remaining time. If you have another session after or a prior commitment, it is fine to keep the session short. But if you have a few minutes to spare after the session, you can conduct the lesson past the scheduled time. With either decision you make, you will still be paid in full for the scheduled session.
If a student doesn’t show up, money will be automatically transferred to the tutor’s account. However, you are expected to wait online until the end of the session (in case the student shows up at some point!).