bookingpress_after_change_appointment_status

add_action('bookingpress_after_change_appointment_status', 'bookingpress_after_change_appointment_status_func', 10, 2);
function bookingpress_after_change_appointment_status_func($appointment_id, $bookingpress_appointment_status)
{
    //$appointment_id updated appointment id
    //$bookingpress_appointment_status updated status
}