I’ll have to miss classes. Do I have to pay for them?

A Delft Method Module is € 190,- and 5 weeks only and you will never get any discount or refund. Better wait for the next starting moment when you have to miss more than one of two classes!
However, in case of urgency, ask your teacher to record the class. If you do that before 17:00 and all the students gave their permission, you’ll receive the recording the day after.