Nettla can reserve money on your bank account for up to 6 days.
If you book something that takes place within 6 days, the amount is reserved until your session takes place, and then charged automatically right after.
If you book something that takes place more than 6 days away, the amount will be automatically charged on the 6th day from the date you made the purchase, and your potential refund (if you cancel) will still work as normal.