There are three types of cancellations in opus1.io.
Visit Cancellations
Late Visit Cancellations
Staff Cancellations

Visit Cancellations
Visit cancellations are regular, client-requested cancellations. If late visit cancellations are enabled, visit cancellations occur when a client requests to cancel their lesson anytime until the late-visit window.
Late Visit Cancellations
Late visit cancellations are late, client-requested cancellations. Late visit cancellations are not enabled by default and can be enabled in your services' cancellation settings. Late visit cancellations occur within the specified late-visit cancellation window.
Staff Cancellations
Staff cancellations are cancellations requested by a staff member, typically a teacher, rather than a client. Staff cancellations are used when your teachers are unavailable for their clients' appointments and sessions.