How is payment refunded?

Since the sitter is cancelling, he/she ideally should have initiated the cancellation right away with Rover to refund your payment. If the sitter isn't doing anything about it, then just call Rover Support at [Edit: Rover’s contact options have changed. Visit the Rover Help Center at https://support.rover.com/ to find the phone number, help articles, or chat with the team] to get the credit processed.