If the booking is cancelled or declined by the activity provider, the service fee will always be refunded. When this occurs, a credit note is automatically sent via email to notify the refund, while the actual charge is reimbursed to the original payment method used during the booking process. Depending on your bank, it could take up to 10 business days for the money to arrive in your bank account.
Generally, if the booking is cancelled autonomously by the customer, the service fees amount cannot be refunded.