bookingpress_after_update_appointment

add_action('bookingpress_after_update_appointment', 'bookingpress_after_update_appointment_func', 10, 2);
function bookingpress_after_update_appointment_func($bookingpress_update_id, $bookingpress_appointment_data)
{
    //$bookingpress_update_id updated appointment id
    //$bookingpress_appointment_data updated appointment data
}