I usually ask for payment in advance of sessions. I do offer a small discount for block booking of sessions. I accept payment by bank transfer/Paypal/Revolut. Once payment is made you session is confirmed by Zoom Invite.
If you cannot make your session please let Karen know as soon as possible so that another session that week can be offered where possible. You will be liable to pay for your session in full where you give less than 48 hours notice
Failure to pay for your session will mean you will not be offered anymore until the last session has been paid for.