Hi guys,
I saw an updated version of the connector yesterday and this issue has been fixed there. Now we are moving into testing of the new version so stay tuned and I will post an update as soon as we release it.
Just needed to polish a couple of things related to how the new connector version is going to work with our new AOM - see
https://blog.x-cart.com/sites/default/files/blog/AOM_X-Payments_sneak_peek.png
PS:
Yes, you will be able to charge shoppers' saved cards if you add something to an existing order and refund differences if you remove